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 Comfortable (2,4)
  2. 4a Increase (4,2)
  3. 8a Like a bird (5)
  4. 9a Edible shellfish, source of mother-of-pearl (7)
  5. 10a Specific — fast (7)
  6. 11a Stimulates (5)
  7. 12a Of course (9)
  8. 17a Charles ___ , Italian-born American bodybuilder, d. 1972 (5)
  9. 19a Prohibited (7)
  10. 21a Refuse container (7)
  11. 22a High-pitched woodwind instrument (5)
  12. 23a Live (6)
  13. 24a Evergreen shrub with glossy fragrant leaves (6)
  14. 1d Agog (6)
  15. 2d Extremely sharp bend (7)
  16. 3d Minister's home (5)
  17. 5d Weepy (7)
  18. 6d Ask searching questions (5)
  19. 7d Polite request (6)
  20. 9d Arson site (anag) — unproven claim (9)
  21. 13d Place for looking at engines, say, under trying conditions? (4,3)
  22. 14d Basis of labneh and lassi (7)
  23. 15d Drift from place to place (6)
  24. 16d Woolly coat (6)
  25. 18d Jousting arena (5)
  26. 20d Exalted (5)