Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a Cornish Lizard, for instance (9)
  2. 8a One-time humble pie ingredient (5)
  3. 9a His/her turn will surely come (7)
  4. 10a Drugs taken to boost muscle mass (8)
  5. 11a Swarm (with life) (4)
  6. 13a Sounded disapproving (6)
  7. 14a Protein-rich seed (6)
  8. 16a Run this way to go berserk (4)
  9. 17a Shocking (8)
  10. 19a Prized pieces of information (7)
  11. 20a Song of praise (5)
  12. 21a Knocked off the top spot (9)
  13. 1d Stop the car (4,4)
  14. 2d Not a single person (6)
  15. 3d Practically (4)
  16. 4d Anonymous (12)
  17. 5d Yes-man libels (anag) – means of mass production (8,4)
  18. 6d Domesticated (5-7)
  19. 7d It only occurs to one later (12)
  20. 12d Upped and left (8)
  21. 15d It may detain one (6)
  22. 18d Window, admiral or guard? (4)