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 Small change to achieve a desired result (10)
  2. 7a Women's hat maker (8)
  3. 8a Repast (4)
  4. 9a Front part of the leg above the ankle (4)
  5. 10a Computer operating system with a graphical user interface (7)
  6. 12a Delighted interest (11)
  7. 14a Hung (7)
  8. 16a Street of houses formerly used as stables (4)
  9. 19a Subdued — spineless (4)
  10. 20a Open to suggestion (8)
  11. 21a Formed into a whole (10)
  12. 1d First sign of the zodiac (5)
  13. 2d Celebratory parties (7)
  14. 3d Sound in mind (4)
  15. 4d Borderline (8)
  16. 5d Member of a wandering pastoral community (5)
  17. 6d Author of On the Origin of Species, d.1882 (6)
  18. 11d Free (8)
  19. 12d Large container for serving drink (6)
  20. 13d Approximate (7)
  21. 15d Hit it off (3,2)
  22. 17d Cold dish of vegetables (5)
  23. 18d Grazing animal(s) (4)