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 Liquid disinfectant (6)
  2. 4a Grassy plains (6)
  3. 9a Hooray! (7)
  4. 10a Sustain (5)
  5. 11a Expression of hesitant agreement (informal) (2-3)
  6. 12a Hitherto (4,3)
  7. 13a Exercise from a standing position and back, spreading arms and legs (7,4)
  8. 18a Marksman (7)
  9. 20a Engraving in low relief on a brooch or stone (5)
  10. 22a Oscar Wilde thought that this was 'something wasted on the stupid' (5)
  11. 23a Small west European country (7)
  12. 24a State of great confusion (6)
  13. 25a Bandage up (6)
  14. 1d Resign (with reputation intact?) (3,3)
  15. 2d Noteworthy period (5)
  16. 3d Police station (informal) (3,4)
  17. 5d Goodbye (5)
  18. 6d Calm — ocean (7)
  19. 7d French existential philosopher and Simone de Beauvoir's partner, d. 1980 (6)
  20. 8d Person living beyond their hundredth birthday (11)
  21. 14d Study of other-worldly sightings (7)
  22. 15d Corvine creature (7)
  23. 16d Heaviest known metal, Os (6)
  24. 17d Senility (6)
  25. 19d 'I know a bank where the wild ___ blows' (Oberon in A Midsummer Night's Dream) (5)
  26. 21d Deserve — virtue (5)