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 Offshoot (6)
  2. 4a (Fatally) defective? (6)
  3. 9a Clever clogs (4-3)
  4. 10a Entitlement (5)
  5. 11a William ___ , king of England from 1087 to 1100 (5)
  6. 12a Infectious viral disease, mainly of children (7)
  7. 13a Regular feature of crossword clues — droops wanly (anag) (4,2,5)
  8. 18a Secular — blasphemous (7)
  9. 20a South Pacific island country where Robert Louis Stevenson died and is buried (5)
  10. 22a Food (said to be relatively cheap) (5)
  11. 23a Shifty (7)
  12. 24a Tibetan mountain guide (6)
  13. 25a Monday (anag) — powerhouse (6)
  14. 1d Source of one's daily bread? (6)
  15. 2d Withdrawn (5)
  16. 3d In an insensitive way (7)
  17. 5d ___ Doone: an 1869 romantic novel by RD Blackmore, based around Exmoor (5)
  18. 6d Moved from side to side (7)
  19. 7d Dislike intensely (6)
  20. 8d Lacking courtesy (3-8)
  21. 14d Like the king of the jungle (7)
  22. 15d Place to rest one's bones (7)
  23. 16d Tiny pieces (6)
  24. 17d Stopgap (4-2)
  25. 19d Fabulous old Greek writer (5)
  26. 21d ___ Shearer, ballet dancer who starred in 1948 film The Red Shoes (5)