Jac 249: Hold it!
The unclued lights (all but one in Chambers's) have something in common. One of the other lights is hyphenated.
ACROSS 3 Arkwright up could be! (11)
9 A crazy Scot's concessionary expression for tinder (6) 11 'Chronicle that . . . so long walk'd hand in hand with time' (6)
14 Our former legal distraint 18 makes sport of? (10)
15 Refuse to ravish a madcap (8)
in maths? It 17 Protozoan description of uni- form raise, perhaps (14) 20 Game to play in bed (4) 21 Young Sprat's sex appeal, following certain lines (4) 22 Notched a couple of points in boxing, so to speak (7) 24 'The golden -- is morning- star to the full round of truth' (5) 25 Put off from joining a Clyde- side Territorial Army unit (5) 27 Clear up after an out-and-out knock out (7) 30 Coming in to catch a rogue out upon it, as it were (4) 32 The inexorability of Spenserian moderates inwardly lessens cor- ruption (14) 35 Sound rogues, one's former countrymen! (8) 36 Powerful cementing agent for a ruffian in the States (10) 37 In which friendship cutteth griefs, we're told (6) 38 In offence, generally end up like apes (6) 39 Footwear of lower standard (1 I ) DOWN I Warming beer in a cotton-mill —but not to a turn? That's out! (II) 2 Worn-out Scots cause rumpus in Rouen (7) 4 A Pole's symbol of respect (5) 5 Sticking out for fringe benefits? (7) 6 Ante-post . . . (5) 7 . . . thrills and spills err most ? (7) 8 Experienced Middle East head teacher . .. (3) 10 ... before retirement in French Morocco (5) 11 A difference of opinion, in a manner of speaking? (6) 12 An immeasurably genuine ophidian? (7) 13 Scots wean in the country (5) 16 Like fashion is, asafoetida's wonderful! (II) 18 Design for living, Boy Scout style? (6) 19 Serves to find flaws in . . . (6) 23 . . a dish a Greek goddess makes up under Aries (7) 25 Switch off that which gives great pleasure? (7) 26 Redress a comparatively senile reverse? (7) 27 What a cricketer does for people in Hunts (6) 28 It turned her head to be queen of the fairies (5) 29 Latiner vicariously employed in boat-building (7) 31 One is thus upset by such a musical alternative (5) 33 Illustrious literary lion (5) 34 Chinese ground-rice afters, say (5)