2661: Spectrum

The unclued lights, four of two words, two individually or six pairs bear a common feature. One of the words does double duty, and another appears in two forms. Ignore three accents in the completed grid.

        Across

   1    Criminal having cheese biscuit that’s not bad (4-7)

   7    Found in cage in tribunal (3)

13    You and I will get lost first with it becoming brighter than 39! (4-3)

16    G and S operas at hotel that’s amongst the greens (5)

17    Scottish challenge at the poultry farm, unendingly (6)

18    Scowl at cow? (5)

20    Rumour of waterway cut by road (6)

22    Small insect begins to nip a bit (7)

27    Hours away from Shoreditch organising game like Farkle (3,4)

29    Hearts removed from fruit in school (5)

30    Old pots belonging to station (6)

34    Penetrate tip of aorta and guts (6)

39    Somewhat dim fool I left on board (6)

40    Smash success! (3)

41    They are wrong about tear-away, a trencherman (6,5)

         Down

   1    Invasive flowering weed – sadly with lots in the Home Counties (3,7)

   3    Partner with pass to sporting association (9)

   4    Capital worker’s fruit upset Ivor (12)

   5    Germanic spirits showing daring in Greek location (7)

   6    Bring up child in care found at the back (8)

   9    Free to exchange vouchers (6)

12    Standing one behind the other, arguing? (2,1,3)

14    Drunk, when speeding (4,3,5)

19    Hollywood star of The Razor’s Edge rebuilt north-east Texan bar (4,6)

23    Direction of thunder storm over house (3,5)

24    Newspaper’s fate at scheduling period on TV (4,4)

25    Emblem reportedly clashed with another in orchestra (6)

26    Canoe re-designed on island – one amongst many? (7)

31    Employ delaying tactics on the farm? (5)

33    Track our late compiler (5)

35    Balt is French husband (4)

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