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  15. 2 d Withdrawn (5)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

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