Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a One who achieved a state of perfect enlightenment, d. c.483 BC (6)
  2. 4a Spend (time in prison) (5)
  3. 7a American fraudster who ran the largest Ponzi scheme in history, d. in prison 2021 (6)
  4. 8a Cook gently in liquid below boiling point (6)
  5. 9a Burrowing shellfish (4)
  6. 10a A selection made purely at random (5,3)
  7. 12a Property specialist — negate taste (anag) (6,5)
  8. 17a US state (with a creeper?) (8)
  9. 19a Wish (4)
  10. 20a Kind of Swiss clock? (6)
  11. 21a Swoop (on) (6)
  12. 22a Camping canvas (5)
  13. 23a Chaste — valets (anag) (6)
  14. 1d Raised bumps for reading (7)
  15. 2d Weak and ineffectual person (7)
  16. 3d Pretentious (informal) (9)
  17. 4d Superficially impressive (5)
  18. 5d Islam's month of fasting (7)
  19. 6d Continent (6)
  20. 11d Small sour fruit used for making jam and jelly (4,5)
  21. 13d Muslim who fought against the Crusaders (7)
  22. 14d Drain (7)
  23. 15d Distinctive — normal (7)
  24. 16d Octave (anag) — wading bird (6)
  25. 18d Golf clubs (5)