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 Bear of very little brain (6-3-4)
  2. 8a Respiratory organ (4)
  3. 9a Remorseful (8)
  4. 10a Make impure (10)
  5. 12a Baffles — projecting remnants (6)
  6. 14a Lab vessel (6)
  7. 15a Payment (for service rendered) (10)
  8. 19a Idle wanderer (8)
  9. 20a American athlete — Scottish soldier (4)
  10. 21a Pretending to be someone else (13)
  11. 2d Flood (8)
  12. 3d __ Mansell, 1992 F1 champion (5)
  13. 4d Put into words (7)
  14. 5d Hair dye (5)
  15. 6d One getting medical care (7)
  16. 7d Porcine sound (4)
  17. 11d Sparkling wine from Italy (8)
  18. 13d Kent seaside resort (7)
  19. 14d Islamic fast (7)
  20. 16d Wooden-soled shoes (5)
  21. 17d (Scottish or Irish) fool (5)
  22. 18d Old MacDonald's establishment (4)