Solvers must resolve all clashes thematically, and complete the unclued grid entry at 44 across.
ACROSS
1 Some charlatan contrived disadvantage on the sly (13, 4 words)
10 I must be in my place, setting (6)
11 Sharper church mouse leaving mass (6)
12 Cheekbone's front pushed right back in a fearful state (5)
14 Surrounded by swirling gnats nipping more (7)
16 "Goodbye for now" copper enunciated (6, 2 words)
17 Servant and master shortened a little gown (6)
21 Handle for bloke's meagre supply (6)
22 No flipping rod in pool just when needed (5, 2 words)
23 Take trouble to go by train (4)
24 Sound's not right in the middle (4)
25 Density most wanted in cotton fabric (5)
27 Forward, backward! Repeat! This is an impossibility (4)
31 Bus system linked to Vatican City travel authority (4)
33 Extremity of fly on novel tent is mesh-like (5)
34 Cell number 90 holds drunken roué (6)
36 Avenues of lopped acacias (6)
37 Is it OK to upset a colony's founder? (6)
39 Uniform decoration has taupe mixed with hints of lilac and emerald (7)
41 Growing out in garden at Epsom (5)
42 Spice - name unknown - gets them back in Togo (6)
43 John is in for a smack in the US (6)
DOWN
2 Bond holds small measures of lime daiquiri - a sign of distinction? (5)
3 Offhand and insolent, losing face (4)
4 Debut of little demon playing electronic organ in France (7, 2 words)
5 Scandinavian woman embraces friend in Aboriginal hut (6)
6 Letter from Henry in Rio - I must go! (3)
7 Peasant women know little lad in Spain (9)
8 Calvinists cherish universal raising of flag perhaps (9)
9 Note upper air - and lower (6)
10 Satchmo's swinging - no end of warmth and charm? (6)
13 Pit in Ruhr working precious material? The opposite (8)
15 Is what launches pervasive advertising material (4)
18 Agent's a fool on a hill (8)
19 Damaged a cuticle? After all it's finely scratched (9)
20 Scrap of cloth turned into superior hat - precious! (9)
26 Half the reciprocal of zero - Derek's sceptical! (7)
28 Ingredient of Ploy's teriyaki? (6)
29 Coin's reverse having name for king (6)
30 Excuse us leaving additional running water (4)
32 Tiny organism shows up around 7 (6)
35 Get fit eating seconds of sauce (5)
38 Knot tier turned up (4)
40 Tail-enders in final race on English river (3)
To enter the competition send your solution, in list format, to me at derek@crosswordcentre.fsnet.co.uk before the 1st April. The first correct entry picked will win a copy of Chambers Book of Araucaria Crosswords v.2 which has been donated by the publishers.