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 Nasdaq, for example (5,8)
  2. 8a Short written message (4)
  3. 9a Lightest gas (8)
  4. 10a Large kingfisher (aka laughing jackass) (10)
  5. 12a Repeat mindlessly (6)
  6. 14a Prime of life (6)
  7. 15a Safari, for example (3,7)
  8. 19a Bulldoze (8)
  9. 20a Mark an 'X' (4)
  10. 21a Pallet picker-upper (8,5)
  11. 2d Not touching a drop (8)
  12. 3d Criminal (5)
  13. 4d Display (7)
  14. 5d Apple drink (5)
  15. 6d Deviation from the norm (7)
  16. 7d Great pleasure (4)
  17. 11d August (8)
  18. 13d Fitting that serves as fulcrum for an oar (7)
  19. 14d Construction worker's helmet (4,3)
  20. 16d Russian pancake served with caviar and sour cream (5)
  21. 17d Hesitate (5)
  22. 18d Leander's lover, who committed suicide when he drowned (4)