Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Act too soon (4,3,3)
  2. 7a Tad (7)
  3. 8a Provide with something specifically required (5)
  4. 10a Whip (4)
  5. 11a Short contest to test acceleration (4,4)
  6. 13a Protest (6)
  7. 15a Joint author with Karl Marx of The Communist Manifesto (1848) (6)
  8. 17a African antbear (8)
  9. 18a Thread (4)
  10. 21a Level odds (5)
  11. 22a Do a bunk (7)
  12. 23a Mathematical function — mainly loop (anag) (10)
  13. 1d Betrayer who acts like a friend (5)
  14. 2d Dirt (4)
  15. 3d Voice quality (6)
  16. 4d Budding (8)
  17. 5d Emit long loud cries (7)
  18. 6d Make better (10)
  19. 9d Agreeable remark (10)
  20. 12d Caricature (8)
  21. 14d Cause to sink without trace — poor Ted (anag) (7)
  22. 16d Noble (6)
  23. 19d Horrify (5)
  24. 20d West African country (4)