Complete
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1 8 10 12 19 21 2 18 3 13 15 4 9 16 5 14 6 17 20 7 11
  1. 1a LSD and K2, for example (9,4)
  2. 8a Threesome (4)
  3. 9a Ancestry of a pure-bred animal (8)
  4. 10a Huge vehicle (10)
  5. 12a Pin for holding meat being roasted (6)
  6. 14a White halo seen around a solar eclipse (6)
  7. 15a Liquid food — a Sioux plot (anag) (6,4)
  8. 19a Thick chewy biscuit made with oats and syrup (8)
  9. 20a (Of a film) full of moral ambiguity (4)
  10. 21a Whispered words of love (5,8)
  11. 2d Jewish skullcap (8)
  12. 3d G-string (5)
  13. 4d Caesar, say (7)
  14. 5d South Asian country (5)
  15. 6d The brightest star in the night sky (3,4)
  16. 7d Not new (4)
  17. 11d Abiding (8)
  18. 13d I'm delighted! (7)
  19. 14d Game played by 'flannelled fools' (according to Kipling) (7)
  20. 16d Prepare for a future role (5)
  21. 17d Desert of north-east Egypt (5)
  22. 18d Keep moving steadily (4)