The unclued lights consist of three associations with each of the three syllables of 40 Across. 

Across

10    Numb, injured with a manacle; his help on the way? (12)

11    Sample a nation, taking the south to heart (5)

13    I rebuke nurse, failing to keep books (7)

16    Prowl around, Rector, during endless gospel (4)

17    Swineherd always gets a day to celebrate (8)

21    Force to translate Cicero? No (8)

22    Bend back always, turning to grab dog (7)

26    One parrot may pick up sticks here? (4)

28    On purpose, learned to be upright (7)

30    One month Fieldfare nearly turned away pairs of quartets (8)

34    With amplifier, silly choir like the sound of blowing into bottle (8)

35    March girl back to college for moulding (4)

36    In Chile, a shifting of the sun (6)

38    Ancient sort of light excellent in gorge (7)

39    Once endure a clumsy churl (5)

41    Poet initially doubled sleeping-sickness risk from this? (6)

42    Cause of this sickness is rising (3,5)

Down

1 PM dismissing first person who devises a plot (7)

2 A thigh raised for nurse (4)

3 November is the last of it, in two senses (6)

4 Madrigal, antique, conveying elegant style (6)

5 Deprived of gun, criminal sprinted (8)

6 I renounce greener moves (7)

8 Maintain one’s submitted to Rome mostly mediaeval theology (9)

9 Having fun hunting songbirds? (7)

12    Wisdom where lots of old people’s homes are? (8)

18    Payment to cover one girl working delicate tracery (8)

19    After one Scots school year start to loathe American dramatist (9)

23    Soil from Epsom regularly put round tree? On the contrary (8)

27    How we are after war: dead! (2,5)

29    Old cars? Charlie’s taken by E-types (7)

31    Pop a question, a bit obscure (6)

33    Spring very advanced last month (5)

37    Players not allowed to speak (4)

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A first prize of a £30 John Lewis voucher and two runners-up prizes of £20 vouchers for the first correct solutions opened on  9 February. Please scan or photograph entries and email them (including the crossword number in the subject field) to crosswords@spectator.co.uk, or post to: Crossword 2736, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.