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 Male singers (9)
  2. 8a Not tinned or frozen (5)
  3. 9a Velodrome vehicle (7)
  4. 10a Unnecessary (8)
  5. 11a Profound (4)
  6. 13a Farm machine (possibly grim?) (6)
  7. 14a Dragon-slaying saint (6)
  8. 16a Military dining room (4)
  9. 17a Telling-off (8)
  10. 19a Non-aligned (7)
  11. 20a Brief written records (5)
  12. 21a City nicknamed Auld Reekie (9)
  13. 1d Under an obligation (8)
  14. 2d Strong and sturdy (6)
  15. 3d Moment – parasitic arachnid (4)
  16. 4d Clean US water (anag) – possible pollutant (7,5)
  17. 5d Type of horse race (12)
  18. 6d Jerome Kern song – Judi Dench sitcom (1,4,7)
  19. 7d Undefinable quality (2,2,4,4)
  20. 12d Herr cent (nag) – cut down expenses (8)
  21. 15d Stock of wines (6)
  22. 18d Dig – larva – nosh (4)