Complete
00:00:00
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 Party snack (6)
  2. 4a Small sealed bag — he acts (anag) (6)
  3. 9a Italian physicist and radio pioneer, d. 1937 (7)
  4. 10a Eager (anag) — to say yes (5)
  5. 11a Humpty Dumpty, for instance (5)
  6. 12a Dreamy relaxed feeling (7)
  7. 13a Having and expressing strong views (11)
  8. 18a Thorough (2-5)
  9. 20a Highest part of a pitched roof (5)
  10. 22a The sharp end? (5)
  11. 23a Clandestine affair (7)
  12. 24a Consideration (6)
  13. 25a Partner (6)
  14. 1d Recording device (6)
  15. 2d Highly strung (5)
  16. 3d Key dietary requirement, obtained from meat, eggs, milk and legumes (7)
  17. 5d Once more (5)
  18. 6d Like Isaac's son Esau? (7)
  19. 7d Abstract principles (6)
  20. 8d Book collector (11)
  21. 14d It's only there to boost the word count (7)
  22. 15d Overdue payment (7)
  23. 16d Smile ingratiatingly (6)
  24. 17d A source of oil — and butter (6)
  25. 19d Kay or Cushing? (5)
  26. 21d Dance music celebrated by Saturday Night Fever (1977) (5)