3936 Convert by Mr Lemon

The title and preamble suggested to Gregson that this would be a puzzle with a religious theme, but this turned out not to be so. In fact, it transpired that the theme was one which Gregson has been expecting to see in the Listener for some time - Harry Potter. The clueing was generally straightforward, although identifying one or two of the misprints and extra letters proved to be a little troublesome, but this did not in any way spoil Gregson's enjoyment of the puzzle. The puzzle was scheduled so that the solution appeared on the same day as the launch of the seventh and final Harry Potter book, and Gregson wonders if we will see more Potter themed Listeners in the future, as there seems to be more than enough thematic material in the series to provide umpteen puzzles.

The extra letters in the wordplay spelt out DIAGON ALLEY PHILOSOPHERS H POTTER. This directed solvers towards the book "Harry Potter and the Philosopher's Stone", in which the title of Chapter Five is "Diagon Alley". The misprints in clues spelt out GRINGOTTS, which is the name of the wizards' bank visited by Hagrid and Harry in this chapter. Upon opening the door of Harry's safe, they find piles of gold, silver and bronze coins. The gold ones are Galleons, the silver ones are Sickles, and the bronze ones are Knuts. One Galleon is worth seventeen Sickles, and one Sickle is worth twenty-nine Knuts. Therefore, with one flick of Gregson's calculating wand, one Galleon is found to be worth 493 Knuts. In Roman numerals, 493 is CDXCIII, which was centrally placed in the grid and had to be highlighted. The intermediate denomination, SICKLE, appropriately located at 17, was also to be highlighted. Gregson noted that Galleon and Knut were also located at relevant places, at 1 (Across) and 29 respectively, in the perfectly Ximenean grid.

Misprints, and extra letters in the wordplay, are indicated by square brackets.

ACROSS
1 Girl led towards large ship (7)
GALLE[D]ON GAL (Girl) + LED + ON (towards)
6 Disregarded animal of various colours outside (6)
PASS[I]ED ASS (animal) inside PIED (of various colours)
12 Staking a crooked tine into horse (7)
AN[A]TEING A + TEIN (anagram of TINE) inside NAG (horse)
13 Cook at diner was under [g]rill [drill] (7)
TRAINED Anagram of AT DINER
14 Jung in front of large vehicle (4)
CARL[G] CAR (vehicle) in front of LG (large)
15 Leo dealt in exotic cedar - a tropical wood (7)
CEDREL[O]A ELO (anagram of Leo) inside CEDRA (anagram of CEDAR)
17 Curved implement to cut out guts of owlets (6)
S[N]ICKLE SNICK (to cut out) + LE (middle letters of OWLETS)
18 After start of ack-ack flying heroes all parachute (9)
AEROSHELL[A] A (first letter of ACK-ACK) + EROSHELLA (anagram of HEROES ALL)
22 Chap takes beer to Sri Lanka (4)
ALEC[L] ALE (beer) + CL (Sri Lanka)
23 Ind[r]a [India] is presented with heart of hibiscus flower (4)
ISIS I (India) + 'S (is) + IS (middle letters of HIBISCUS)
India = I from the phonetic alphabet, and flower = river (something which flows)
25 Web gains control over missing Australian drivers (9)
TE[L]AMSTERS TELA (Web) + MASTERS (gains control over), less A (Australian)
27 Hit naughty child in Kent, perhaps without a hint of remorse (6)
STRIK[E]E TIKE (naughty child) inside SE (Kent, perhaps), all outside R (first letter of REMORSE)
30 Dairymaid by Canadian waterfalls removes brackishness? (7)
DE[Y]SALTS DEY (Dairymaid) + SALTS (Canadian waterfalls)
Here, the wordplay requires salt(3) in Chambers
31 Some of Thai replied "It may be gathered in a b[i]n [bun]" (4)
HAIR Hidden, part of "Thai replied"
32 Welshman examines with impertinence the places where Dunlop's made? (7)
DAI[P]RIES DAI (Welshman) + PRIES (examines with impertinence)
Dunlop is a type of cheese originating from Ayrshire
33 Shrub with berries found unripe in outskirts of Jeddah (7)
JUNIPER[H] UNIPER (anagram of UNRIPE) in JH (first and last letters of Jeddah)
One of the definitions of "found" is "to cast", thereby indicating an anagram
34 A new government undergoes anxieties (6)
ANGS[I]TS A + N (new) + G (Government) + SITS (undergoes)
35 Cleansers without active ingredient damaging pieces of furniture (7)
SCREENS[L] Anagram of CLEANSERS, less A (active)

DOWN
1 England captain once having secured first of tests has a pleased expression (6)
GO[O]TCHA GOOCH (England captain once) containing T (first letter of TESTS) + A
Graham Gooch is a former England cricket captain
2 Workmate accepts nothing [n]earing [bearing] being capable of supporting weight (11)
LOAD-BEARING LAD (workmate) containing O (nothing), + BEARING
3 [G]rail [Drail] refurbished for man of property (5)
LAIRD Anagram of DRAIL
4 Close, no tail-ender, admitted to aims on square: at least 18 (7)
ENNEADS[S] NEA (NEAR ie close, minus last letter) inside ENDS (aims) + S (square)
In the surface reading, "Close" is referring to Brian Close, the former Yorkshire and England cricketer
5 Untidy end for T[o]d [Ted], perhaps (3)
NED Anagram of END
Ned and Ted being shortened forms of Edward
6 French peas start a Frenchman's evening - and where he goes later? (7)
P[O]ISSOIR POIS (French word for PEAS) + SOIR (French word for EVENING)
7 One opposed to American [T]T [NT] Institute (4)
ANTI A (American) + NT + I (Institute)
8 Evan speaks heatedly about Long Island producing an expression of surprise (11, two words)
SNAKES ALIVE[P] SNAKESAVEP (anagram of EVAN SPEAKS), outside LI (Long Island)
As indicated in the preamble, this expression is not in Chambers, but it can be found in the Shorter Oxford.
9 Listen to Liberal peer (4)
[H]EARL HEAR (Listen to) + L (Liberal)
10 Proofreader's sign - wiggly one between end of word and next letter? (4)
DE[E]LE EEL (wiggly one) between D (last letter of WORD) and E (next letter after D)
11 [T]art [Part] singing a belter, possibly (6)
TREBLE Anagram of BELTER
Gregson is unsure how the "a" works in the cryptic reading
16 Curved top to cut in rare diamond (5)
[R]ARCED C (first letter of Curved) inside RARE, + D (diamond)
19 Non-residents constructed ne[s]t [next] on square without a sign of hesitation (7)
EXTERNS EXTN (anagram of NEXT) + S (square), outside ER (a sign of hesitation)
20 More effeminate gentlemen embrace heads of six sensual Indian eunuchs (7)
SISSIER[S] SIRS (gentlemen) containing SSIE (first letters of six sensual Indian eunuchs)
21 Border he had leaned over (6)
LIST[H]ED LIST (Border) + HE'D (he had)
24 Special forces in Scots messes (6)
S[P]OSSES S (Special) + POSSES (forces)
26 Horizontal rail to secure aggregate (5)
BAR[O]RE BAR (to secure) + ORE (aggregate)
27 African tree hates being moved (4)
SHEA[T] Anagram of HATES
28 Dark viscous mixture in Tennessee lake (4)
T[T]ARN TAR (Dark viscous mixture) inside TN (Tennessee)
29 Half-heartedly competitive as a young blood (4)
K[E]NUT KEN (KEEN ie competitive, with one central letter removed) + UT (as)
32 Infernal deity is chasing debtor (3)
D[R]IS IS following DR (debtor)