2107: Problem X

18 (two words) will know that where ‘Q’ = ‘the number of’: Q1D x ([Q5A x Q37/35] – Q11/42) x Q22 = Q the 19. Elsewhere, ignore four accents.
 
Across
1 Glitches involving a thousand aircraft (6)
10 Relationship of rhino and fox with earache, gent treated (14, three words)
13 Mysteries of anonymous ladies artist captures? (6)
16 Familiar fellow gobbles mutton (5)
17 Some Bramleys turned over tree (3)
20 Atheist rebuilt wharf up north (7)
23 Coco possibly cross following bribe (8, two words)
24 Incited, one from Glasgow bristles (5)
25 Large quantity of sheep crossing middle of field (5)
27 Wind borne by flower in fenland spot (8)
30 Rushes collecting round English flower (7, two words)
33 Game sporting pundit ran (9, doubly hyphened)
38 Inventor rounded end of match (6)
39 Evangelical quaffing litre is rarely crafty (4)
40 Mark can tie the knot here (14, two words)
41 Deferring hearing about unique selling point? (8)
 
Down
2 Stage of illness ailing older patient (12, two words)
3 Mr Short edited articles (5)
4 Ten moist bread rolls in small pot (6)
5 Holiday destination (Spain not Austria) (4)
6 Old policeman (close to 65) set off (7)
7 Tenors in digs (7)
8 Georgia’s charm lit up moaner (6)
9 Fish bluer river contained (8, two words)
12 I sail the rolling river below round islet (7)
14 Plant Clyde Barrow nobbled, lad uprooted (8)
15 Nutty Ray Brown twice polled neat tree (12, two words)
21 Prisoners, cardinal took to court, climbing outside (7)
26 US city sensible Scots sweetheart’s visiting (7, two words)
28 Synopses of a book about unfulfilled romance of yore (7)
29 Special outfits for youngsters (6)
31 MCP bores friend in Italian resort (6)
32 Not in mind’s eye, swimming terrapins (6)
34 Old general manager in charge of ancient characters (5)
36 Hole in nose gutted Pearl (4)
 
A first prize of £30 for the first correct solution opened on 22 April.