Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Tight-fitting trousers (3-7)
  2. 7a Important Hindu prince (8)
  3. 8a Calf meat (4)
  4. 9a Brock's residence (4)
  5. 10a Ukrainian-born Marxist, expelled from the Soviet Union by Stalin in 1929 and later assassinated (7)
  6. 12a Mexican seed in which a hatched larva moves (7,4)
  7. 14a (Crime) carried out from a moving vehicle (5-2)
  8. 16a Syncopated music (4)
  9. 19a Beatles' number? (4)
  10. 20a Marine crustacean, which lives attached to submerged surfaces (8)
  11. 21a Platinum anniversary (10)
  12. 1d Obverse call? (5)
  13. 2d Illusory — ghost (7)
  14. 3d Salt Lake City's state (4)
  15. 4d Smart clothes for a formal occasion (informal) (4,4)
  16. 5d (Join with) a metal fastener (5)
  17. 6d Face wiper (6)
  18. 11d Country formerly called Rhodesia (8)
  19. 12d Slang (6)
  20. 13d Issue forth (7)
  21. 15d Vigour and vitality (5)
  22. 17d Zero (5)
  23. 18d Guitar part (4)