Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Someone no longer required (4,4)
  2. 5a Tiny bit (4)
  3. 9a Single figure (5)
  4. 10a Continuing indefinitely (7)
  5. 11a -273.15 Celsius (8,4)
  6. 13a Generous (meal?) (6)
  7. 14a Insouciant (6)
  8. 17a (French?) trifle (7,5)
  9. 20a Organ; examine closely (7)
  10. 21a As spinach, cabbage or a tree? (5)
  11. 22a Protein-rich plant (4)
  12. 23a Oz city (8)
  13. 1d Ashmolean's extinct bird (4)
  14. 2d Branch of maths (7)
  15. 3d Peerless (7,5)
  16. 4d Impenetrable (6)
  17. 6d Ether (anag.) (5)
  18. 7d Inaccurate term (8)
  19. 8d LA suburb (7,5)
  20. 12d PM's retreat (8)
  21. 15d Fried tortilla dish (7)
  22. 16d Wine store (6)
  23. 18d Dirge (5)
  24. 19d Computer storage unit (4)