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 Bird with a chisel-like bill for boring into a tree to find insects (10)
  2. 7a First part of the small intestine, immediately beyond the stomach (8)
  3. 8a Something to eat (informal) (4)
  4. 9a Administer drugs to improve one's athletic performance (4)
  5. 10a Drive a car stolen for the purpose (7)
  6. 12a Can be shown to be right or warranted (11)
  7. 14a The Grand Canyon state (7)
  8. 16a Many doors have one each side (4)
  9. 19a Explosive device (4)
  10. 20a Classification of plants and animals (8)
  11. 21a Relax (4,2,4)
  12. 1d Cause bodily (or emotional) pain (5)
  13. 2d Mythical Greek king with a complex — Opus Dei (anag) (7)
  14. 3d Kind of music with deliberately offensive lyrics (4)
  15. 4d Pol Pot country (8)
  16. 5d With a strong wish (to do something) (5)
  17. 6d Hold close to give comfort (6)
  18. 11d Brief evocative description or episode (8)
  19. 12d Lingo of a particular group (6)
  20. 13d Sudden event that brings great wealth (7)
  21. 15d Striped quadruped (5)
  22. 17d With frequent jolts (5)
  23. 18d Depart (4)