Three unclued lights featured the remaining ones, two of two words, the others paired. Two of them do double duty. Elsewhere, ignore one circumflex.
 

Across

7/7D Part of microscope under old coach (8)
11    Country house’s grand spread (6)
15    This is very slow, taking only a second to catch (5)
16    Pretentious fellow taken to court, reportedly (5)
17    Hold prisoner and bury at noon (6)
18    Rubber rope (5)
20    Possibly 22’s special ceremony (6)
21    Entrance halls where amateur match gets cut (5)
22    Upset goldminer spurns do for troublesome creature (7)
27    Mathematical array from graduate taking a moment (7)
29    Put to use some cheap plywood (5)
30    Bush, perhaps, angry initially about secret service (6)
34    Theatre mission (6)
36    Italian singer’s instrument that’s not playing (5)
38    Reserved half the area with worker (7)
39    Ridges made when surrounding network (6)
41    Mistakenly rely on euros when travelling (11)
 

Down

1    Extremely angry when beer harvest season that’s produced when cut
(10, two words)
2    Moving targets or no end of war are instruments of death (8)
3    Might waste time at this period during an LOI (9)
4    Perhaps patient needing bandages produces light luggage? (12, two words)
5    Old shed below, second-hand (7)
7    See 7 Across
9    Old apple sent up for £10 (6)
10    Eyesores, in a way? That’s right (5)
12    Two little boys are prey (6)
19    Distinguished — now my heart flutters (10)
21    Hors d’oeuvre from Spain a tot ordered (9)
24    Displace Amiss current England captain (6)
25    Former pupils having manual about English (7)
26    Pot-holer takes a day finding dead body (7)
28    Marks and other currency (6)
31    Blood carrier, a kind heading off on ambulance initially (5)
33    Tourist guide or messenger, at heart, is dreary over the border (5)
35    Talk of Minet? (4)
 
A first prize of £30 for the first correct solution opened on 5 December. There are two runners-up prizes of £20. (UK solvers can choose to receive the latest edition of the Chambers dictionary instead of cash — ring the word ‘dictionary’.) Entries to: Crossword 2386, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.
 
Please note the early closing date for entries.
This is because of the Christmas production schedule.