2666: All secure

Unclued lights (one hyphened, two of two words) have something in common. Ignore one accent.

Across

1    I hand round a mostly poor-quality coarse fibre (8)

6    Urge to chase round and round behind lobby (6)

12    Appear unhappy about choppy sea tending to wrinkle (6)

14    Very healthy backing by old sports fan (6)

17    Get sick in lung (not heart): in turn, it’s to do with brain tissue (5)

18    Keystone, one of five around circle (5)

20    More like Heep, not fat? That is right (7)

21    Address to composer by director excelled (7)

24    Forage to bring back European meat product (5)

25    Quite quiet, always (5)

30    Team welcoming hard home fixtures (7)

32    A new fruit rotted, as shown later (2,5)

36    Small portion of meat: a steak (5)

37    Tell the last two to leave the table (5)

38    Cotton garments irritate his arm (6)

40    Quisling was such an animal (6,3)

41    Couple I came across retiring (4)

Down

1    Puritans run in greedy types (5)

2    Nest in a lake (5)

4    Corner is blue occasionally, yes (3,2)

5    A piece from Ontario’s top poet (7)

7    Foolish, like 19? (7)

8    Idle on set, one has meteoric career (6)

9    Oxygen determined in smaller quantities to be undetectable (9)

13    Messily crush sea creature and get the tail off (7)

15    In great anxiety over a year, complied with scurvy treatment (8)

19    Endlessly itinerant, wandering for periods of years (8)

21    Hiding nothing, surgeon’s restoring health (9)

22    One commanding men does protect queen (7)

26    Time member of flying squad arrested punter (7)

28    Inferior oats for cooking (2,1,4)

29    Is about to make mistake with answer range (6)

31    A line’s heard: ‘Charge!’ (6)

33    Isolated with raised temperature with no discount (2,3)

34    Drop over capital (5)

35    Scottish peer’s second prison sentence (5)

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