Complete
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1 9 11 15 17 21 25 2 12 3 13 20 24 26 4 18 5 16 19 14 8 10 22 6 23 7
  1. 1a Convolution (9)
  2. 8a Jamboree (4)
  3. 9a Part of a pneumatic tyre (5,4)
  4. 10a Milton or Betjeman, say (4)
  5. 13a Childish rabbit (5)
  6. 15a Bracelet worn for ornament or identification (6)
  7. 16a Oil well with a strong natural upward flow (6)
  8. 17a Excuse — excuse me! (6)
  9. 19a Move up and down repeatedly (6)
  10. 20a James ___ , English actor, d. 1984 (5)
  11. 21a Small stream (4)
  12. 24a Swimmer who goes down without any breathing equipment (4-5)
  13. 25a Dry — dull (4)
  14. 26a Amount by which a number rises (9)
  15. 2d Zero (4)
  16. 3d Stagger (4)
  17. 4d Material use for musical strings, made from intestines of sheep or horses (but not cats) (6)
  18. 5d Raising to the third power (6)
  19. 6d Racket (9)
  20. 7d It can open many doors (6,3)
  21. 11d Holidaying vehicle? (6,3)
  22. 12d Plant — airy malls (anag) (9)
  23. 13d Garden broom made of twigs (5)
  24. 14d Westernmost Canadian territory (5)
  25. 18d Serviette (6)
  26. 19d West Sussex seaside resort, granted the suffix Regis (of the king) by George V (6)
  27. 22d Pre-1939 name for Thailand (4)
  28. 23d Frond plant (4)