Complete
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1 8 10 15 17 21 23 2 12 18 3 13 9 19 4 24 5 11 20 22 6 14 7 16
  1. 1a Kind of watch chain (6)
  2. 4a Annoy persistently (6)
  3. 8a US world heavyweight boxing champion, b.1966 — English fast bowler, d. 2015 (5)
  4. 9a Passed out (7)
  5. 10a Oxford academic notable for mixing up his syllables when talking, d. 1930 (7)
  6. 11a English poet, said to be 'mad, bad, and dangerous to know', d. 1824 (5)
  7. 12a Working in a well-organised and competent way (9)
  8. 17a Piggy noises (5)
  9. 19a Enthusiastic and loud applause (sometimes standing) (7)
  10. 21a Home providing care for the sick (7)
  11. 22a Lowest male singing voice (sometimes 'profundo') (5)
  12. 23a Stella (anag) — waiting to go (3,3)
  13. 24a Petition to a deity (6)
  14. 1d Condition involving impaired social interaction (6)
  15. 2d Made to order (7)
  16. 3d Quarrel (3-2)
  17. 5d Of a sweet and friendly disposition (7)
  18. 6d Lustful woodland god — stray (anag) (5)
  19. 7d Finale (6)
  20. 9d Take back property because mortgage payments due have not been paid (9)
  21. 13d Offering fun and gaiety (7)
  22. 14d Parched (7)
  23. 15d Moses's successor, victor of the Battle of Jericho (6)
  24. 16d Taking place within a building (6)
  25. 18d Through the nose? (5)
  26. 20d Medium to dark brownish-yellow colour (5)