The unclued lights (and 4 Down + N) are of a kind and along with the suggestion given by the title, they indicate how all the solutions (clued and unclued) have to be adapted before being entered into the grid. Ignore two accents and one apostrophe.
Across
6 Carillon playing opening arrangement of 34 (4)
12 Reactin’ badly, for sure (7)
14 Spade I swapped for a weapon (6)
15 Facetious interjection of Turkish governor that’s worthless in Wick (7)
16 Tailless rodent, active at hollow (4)
20 Make a fool of old boy – dock a shilling (3)
22 Mild stimulant for Herbie, we’re told (5)
23 Knave’s regular bird over the border (3)
24 The time for you and me in Denmark (4)
26 Puffs for fashionable models (5)
30 State with a drowned valley (3)
31 Terrible blunder in Bordeaux removing measure from fine prospect there (5)
34 You must interpret Tennyson’s ‘… onward!’ as just 80 yards (3)
36 Unofficial boycott (5)
38 Shakespeare shuts bird on reserve (6)
39 Ambassador on US railroad has a great deal of cheek (6)
40 Extorted some venerable deacon (4)
42 It’s risky removing end of lock from driver’s seat (5)
43 In Italy two miles to cathedrals (5)
Down
2 Blaise is head over heels about this girl (6)
3 River that’s questionable, we hear (3)
4 Étudiant vu de derrière le verger (5)
5 Royal daughter’s vile anger (5)
6 Felicity and Jack with Scottish grandchild (3)
8 During autumn, a heron on Kirn’s river (4)
11 Work up the incidental part of play? (6)
17 Reverse the flow? (3)
18 Lout, with or without money (3)
19 Ban removed from new Barcelona teletext service (6)
21 Censor some screed I translated (4)
25 Meals distributed to state capital (5)
27 Died on river, by the way (2)
28 Poorly, having water in, affecting the intestine (5)
29 With spirit, has stirred porridge (5)
33 Old way to fly at night (4)
35 14 cut reading in the Hebrew Bible (3)
A first prize of £30 for the first correct solution opened on 24 March.
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