The dictum at 30 (from a 19 song) affects all Down entries, including its near-homophone at 3 (a dictum associated with the eponymous character at 29); 3 affects all Across clues.
ACROSS
1 West European is appearing during afternoon showing military arrogance (11)
11 Shock about Chinese money in French department (7)
13 Master, one carrying barrel (4)
14 Energy and endless appetite I have easily secured (7)
15 Nautical equipment to damage rods and staffs (13)
17 Pairs about to go for nothing in sports (5)
18 Common in popular area (4)
19 See preamble (8)
20 German chasing silver bit (5)
21 Study of geriatrics adapted to only one age, mostly (11)
23 Article securing pipe in monoplane (5)
24 Observe little US money securing tons in harvest (8, 2 words)
27 Malignant spirit – everything’s ending in insensibility (4)
28 Sportsman accepting large waffle (5)
30 See preamble (13, 2 words)
33 Moon of Neptune with sulphur and carbon would wreck spacesuit (7)
34 Cultured person giving edition of Bible to church (4)
35 Stop newspapers operating (7, 2 words)
36 3-D images got chaps very excited, missing opening of gallery (11)
DOWN
1 Reduction in disease making Scots grumble (4)
2 Location system, excellent for planes (one excluded) (5)
3 See preamble (13, 2 words)
4 Popular bridge team representing legal institutions (4)
5 Verdi opera presented in modern animation (6)
6 Fabric has to provide inner layer, after ends cut (6)
7 European country’s one chasing light Mediterranean fish (7)
8 I sort out stars in arrangement – for these? (13)
9 Capital city unknown before taking leading position (7)
10 Show theatre to hold 25? (9)
12 Edgy US hospital show, see, set in US city (5)
16 Former difference between ‘latter’ and ‘later’? (3-4)
17 Slight indication is enthralling one tense researcher (9)
21 Playwright’s quiet regarding birds (7)
22 Financiers mention reduced longing about money (7, 2 words)
24 Japanese ornamentation? It’s broken up (6)
25 Dickens hero supporting good reason for feud? (6)
26 More than half of details turning up in literary genre (5)
29 See preamble (5)
31 Bank honestly mislaying a pound (4)
32 Water channel you once covered with tin (4)
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