The unclued lights (one of two words) are of a kind.
Across
1 Bringing down plane that was used on D-Day (7,5)
12 Heart tremor? (10)
14 Member in bar, musing (3)
17 Folds in damask curtains partly drawn back (5)
18 Married? Possibly him! (7)
19 Provide plaster (6)
22 Agamemnon’s father sure to be murdered after a time (6)
24 Entrance halls where amateur contest gets cut (5)
26 Having just one connection travelling via tunnel (9)
29 Biblical heroine abandoned by husband in compound (5)
31 Tenor dear to the Italians around the States (6)
34 Like Muldoon, son gets mad (6)
36 French dish – new variant – underdone (7)
39 One who authorises girl-friend briefly to enter stately home (8)
40 Lengthen in both directions (3)
41 Restores control across the Atlantic (10)
43 Succeed in a hedge market that’s volatile (4,3,5)
Down
2 Majesty has thirty-one days on Cape (10)
3 Becomes gloomy managing dreadlocks Doc cut off (7)
4 Fellow leaves France, trained as button-maker (5)
5 Food plant crushed by overturned barrel (9)
6 Island ways reported by cricketer Wilfred (6)
7 Musket Rufus illegally holds (5)
9 Like some drugs? All there is in genuine wrapper (12)
11 Frame opening demand of horrid letter (4-4)
16 Age to retire and live (3)
19 Sovereigns are required in the maths lesson! (6)
21 Specific aviational measurement of Herbert F.

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