Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a David Bowie's alter ego of the 1970s (5,8)
  2. 8a Most populous country in Africa (7)
  3. 9a Tick off (5)
  4. 10a Impudence — annoy (4)
  5. 11a Paying no attention (8)
  6. 13a Seafood, usually steamed in wine (6)
  7. 14a Hidden marksman (6)
  8. 17a Recondite (8)
  9. 19a Poke (4)
  10. 21a Silly (5)
  11. 22a Without hesitation (7)
  12. 24a Sundry (13)
  13. 1d School of Buddhism that stresses meditation and intuition as the way to knowledge (3)
  14. 2d Protective eyewear (7)
  15. 3d Account of a series of events (which can be spun) (4)
  16. 4d Subjected to banter (6)
  17. 5d Becoming more distant (8)
  18. 6d Join forces (5)
  19. 7d Regarded as precious (9)
  20. 10d Place equipped for sports or physical training (9)
  21. 12d Buttocks (euphemistically) (8)
  22. 15d Colonnade (7)
  23. 16d Stellar (6)
  24. 18d Cobs and pens (5)
  25. 20d Mountain lake (4)
  26. 23d Affirmative! (3)