This puzzle marks the 40 of a 33 29. 16A, 24 and 1D (four words) are three of his works. 7 (hyphened) and 22A combine to give an anagram of the 29’s name (hyphened).
 

Across

1 Dawkins & co engaged in jobs (8)
6 We possess drugs Dutch proscribed (6)
11 Plants ruin York and 40% of Essex (10)
13 Unit younger girl turns over (5)
14 Whimsical women rejected wrong doctrine (8)
17 Measuring rod keeps man happy, given new handle (7)
18 Clot’s mobile broken by Charlie (7)
19 Lengthening words in impressive short essay (9)
23 Sugar apple in turnover (6)
26 Proficient judoka cycles also (3)
30 Outré fans rashly filmed vampire (9)
32 Airways serving popular drinks (7)
35 Direct British film star (5)
36 Move around tumulus trailing cuckoo (8)
37 I preach against high-flyer US expelled (5)
38 Sullen posh boy footles vaguely (10)
39 Functioning part of workforce like Google (6)
 

Down

2 Very few psalms producing rebukes in kirk (7)
3 Football team almost suffocates in lift (7)
4 Crew support single-decked vessel (6)
5 Very good house somewhere in London (4)
8 Statute had banned table-dancing (out of order) (11, two words)
9 Wader crossing long narrow sands gets put off (7)
10 Real music with lyric composed in a certain form (14)
12 Apostle more into transgression (5)
15 Practices in Iceland initially may surprise (4)
16 Puzzling magician let loose (11)
20 Gordon’s onion busybody peeled (4)
21 Day one climbs trees (4)
22 Railroaders are last to dock in German port (8)
25 Mid-September bookish husband cut wheat (7)
27 Salt from UK navy stands in for tenor (7)
28 Watchtower in Albania always active (7)
30 Some generous tyrant (4)
31 Splendour of our flag (not one flapping) (6)
34 Special container for what’s left of regalia? (4)
 
A first prize of £30 for the first correct solution opened on 7 April. 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 2154, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.