Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a Powerful — stringy (6)
  2. 4a German playwright, author of Mother Courage and Her Children, d. 1956 (6)
  3. 9a African country — ruin dub (anag) (7)
  4. 10a Administered corporal punishment (5)
  5. 11a Bottomless chasm (5)
  6. 12a It's impossible to see without one! (7)
  7. 13a Buffet-style meal (11)
  8. 18a Type of quadrilateral (7)
  9. 20a Nothing (5)
  10. 22a Dislike intensely (5)
  11. 23a Affair (7)
  12. 24a Minutes for a football match (not counting stoppages or extra time) (6)
  13. 25a Repulsive (6)
  14. 1d Passage underground (6)
  15. 2d Excitable (5)
  16. 3d A royal house (7)
  17. 5d Explore — scout (informal) (5)
  18. 6d Man with a body like a horse? (7)
  19. 7d Little — squiffy (6)
  20. 8d Buried container for future discovery (4,7)
  21. 14d Mainly black aquatic rail (7)
  22. 15d Most common UK bird of prey (7)
  23. 16d Take into holy orders (6)
  24. 17d Cheers (6)
  25. 19d Exploded (5)
  26. 21d Horse-catching rope (5)