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 One after another (13)
  2. 8a Highest point of achievement (4)
  3. 9a Treatment for the feet (8)
  4. 10a Commotion (10)
  5. 12a Get away (6)
  6. 14a Small yellow and black finch (6)
  7. 15a Somewhat (10)
  8. 19a Motherly (8)
  9. 20a Naked (4)
  10. 21a With a very tight budget (2,1,10)
  11. 2d Naturally! (2,6)
  12. 3d Heave of the sea's surface (5)
  13. 4d Competent (7)
  14. 5d (Of the sea) ebbing and flowing (5)
  15. 6d Winners (7)
  16. 7d Traditional knowledge (4)
  17. 11d Co-founder of al-Qaida, killed 2011 (3,5)
  18. 13d Without purpose (7)
  19. 14d Excess (7)
  20. 16d No idea (informal) (5)
  21. 17d Carreras, for example (5)
  22. 18d Daybreak (4)