4044 OOOOPPPP by Raich

Raich gave us a nice puzzle with some fun clues. The message given by extra letters in wordplay gave us HIGHLIGHT CONTAINER TWENTY NINE LETTERS. USE PARKINSON’S LAW. Parkinson's Law is the adage first articulated by Cyril Northcote Parkinson as the first sentence of a humorous essay published in The Economist in 1955. Parkinson’s Law is “Work expands so as to fill the time available for its completion. With just enough letters in the unchecked cells to start us off, the title came to our assistance. The title represented the abbreviation OP (work) expanded four times. The grid required the word WORK to be written four times downwards. Surrounding the “expanded” work could be highlighted the surrounding 29 letters TIME AVAILABLE FOR ITS COMPLETION.

Extra letters in wordplay are indicated by [ ]
 
Across
1 The right answer to scheme obsession - re-establishment elsewhere (13)
TRANSPLANTING T’ + R + ANS + PLAN + T[H]ING
11 Third and last segment - fantastic time linked to a god with a kiss (10)
METATHORAX Anagram T[I]ME + THOR + A X (kiss)
13 Plant old turf, not on a meadow (6)
AZALEA [G]AZON less ON + A LEA (meadow)
14 One's seen in moving Pathe image (5)
PIETA Anagram PAT[H]E containing I
15 Namibians in this place change direction in part (7)
HEREROS HERE + RO[L]E changing E to S (directions)
17 Plutocrat regularly stopped working (rich!) (6)
LOADED regular letters pLutOcrAt + D[I]ED
18 Clasp fold ignoring a small wave (7)
RIPPLET [G]RIP + PLEAT less A
20 I applied to I in German dialect (5)
IONIC I + ON + IC[H]
23 Silent play with German setter (4)
MIME MI[T] (with in German) + ME (Raich!)
24 A Victoria Cross presented to a sailor - it glorifies supremely (6)
AVATAR A VC + A TAR
25 Ark man detailed to international body (4)
NATO N[O]A(h) (detailed here means “without a tail!”) + TO
27 Love European account of intestinal part? (5)
ILEAC [N]IL + E + AC
28 A large number going back to study past (5)
OLDEN LO[T] reversed + DEN
29 Retiring intellectual ignoring ordinary racing world (4)
TURF F[A]ROUT less O (ordinary) reversed
31 Thought highly of enraged Democrat (5)
RATED [I]RATE + D
35 Sonnet rewritten censoring hint of eroticism at one time (4)
ONST Anagram SO[N]NET less E(roticism)
37 Old air company with the French package of goods (4)
BALE B[E]A + LE
38 1960s chart-topper Helen raised note near unfinished club (7)
SHAPIRO SHA[R]P + IRO(n) (ref. Helen Shapiro)
43 Soft line's taken for Northern shrub (5)
ELDER [T]ENDER swapping L for N
44 Gypsy cheek about Indian dish? (5)
PILAF FA[W] + LIP (all reversed)
45 Sacrament's good for Catholic Eastern State (6)
PENANG PENANC[E] changing C (catholic) to G (good)
46 Radical supporter associated with Netherlands (5)
ALLYL ALLY + [N]L
47 Come again? In return, answer it is not (8)
REATTAIN A (answer) in RET + ‘TAIN[T]
48 Not all foolhardy, a youthful time of influence (3)
DAY Hidden foolharD[Y] A Youthful
49 Understands Southern English ensign (4)
SEES S + E + E[N]S
50 It's eery, unusual, stubborn in Perth (6)
REESTY Anagram [I]T’S EERY
 
Down
2 Taking in rare modern opponent translator's abandoned (8)
RECEIVAL RECE[N](T R)IVAL less TR (translator)
3 Northeast Arizona beginning to evacuate cape (4)
NAZE N[E] + AZ + E(vacuate)
4 With natural illumination that's annoying picked up cheerful air (7)
STARLIT RATS! Reversed + LI[L]T
5 Tissue home help, first out, crumpled (6)
PHLOEM Anagram (h)OM[E] HELP
6 Ivy twisted a lariat (6)
ARALIA Anagram A LARIA[T]
7 Card game also good for nothing (5)
NAPOO NAP(card game) + [T]OO
8 Unpublished, I require Italian editor (8)
INEDITED I N[E]ED + IT + ED
9 Our French characteristic (4)
NOTE NOT[R}E
10 MA, say, works hard on start of electric railway - unsentimental stuff! (12)
GRADGRINDERY GRAD (graduate) + GRIND[S] + E(lectric) + RY (railway)
12 Fever hospital inside before one is supporting (9)
PHRENITIS H (hospital) in PRE + [U]NIT (one) + IS
16 Fix fish tanks (4)
STEW STEW[S] 2 definitions
19 Head service passage like a generator (10)
PATERNALLY PATE + RN (Royal Navy) + ALL[E]Y
21 Bedding the Italian stud (4)
NAIL NA[P] + IL
22 Contention about the tide (4)
CASE CA (about) + SE[A]
26 Fliers enthralled by large changelings (4)
OAFS [R]AF in OS (outsize)
30 Knee's equivalent Saint provided - mounted deer (6)
STIFLE ST + IF (provided) + EL[K] reversed
32 Surgically remove a boil, mostly on toe's skin (6)
ABLATE A BLA[I](n) + T(o)E
33 Little time on circuit (3)
TAD T + A[N]D
34 'E's to dash off writ (6)
ELEGIT E’[S] +LEG IT
36 Central principle ignoring unknown silk cloth (5)
KENTE KEYN[O]TE less Y (unknown)
39 Greeting network openings (4)
HILA Hi + LAN (local area network)
40 Excellent gods changing sides at start (4)
RARE LARE[S] changing R (right) to L (left)
41 "Bounds" begins in verse (4)
OPES [L]OPES
42 Revere sports administrators grabbing attention (4)
FEAR F[A] (football association) + EAR
44 Hand daughter cushion (3)
PAD PA[W] + D (daughter)