Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Rise as if by magic (8)
  2. 5a Pile (4)
  3. 9a Island south of Sicily (5)
  4. 10a International organisation conĀ­cerned with human rights (7)
  5. 11a American national song, popular since the War of Independence (6,6)
  6. 13a Go back on one's word (6)
  7. 14a One discriminating against those who may be getting on? (6)
  8. 17a Julius Caesar's boast after his victory at the Battle of Zela (4,4,4)
  9. 20a Piled up arrangement of hair on the head (7)
  10. 21a Seawater (5)
  11. 22a Protein-rich bean (4)
  12. 23a Plants, such as ivy (8)
  13. 1d Acidic citrus fruit (4)
  14. 2d Bad guy (7)
  15. 3d American holiday on the fourth Thursday in November (12)
  16. 4d Go (6)
  17. 6d Alleviated (5)
  18. 7d Acts of defrayal (8)
  19. 8d Not to be excused (12)
  20. 12d Seriousness (8)
  21. 15d Slope (7)
  22. 16d One who revises another's writing (6)
  23. 18d Diaper (5)
  24. 19d Optical device using light to form images (4)