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 Immense (8)
  2. 5a Restless desire (4)
  3. 9a Zirconium, for example (5)
  4. 10a Wise king of Israel (7)
  5. 11a Good enough (12)
  6. 13a Maintenance (6)
  7. 14a Desert-dwelling rodent (6)
  8. 17a Science of the properties of celestial bodies (12)
  9. 20a Hampered (7)
  10. 21a One who loafs about (5)
  11. 22a Tale (4)
  12. 23a Gloaming (8)
  13. 1d Deciduous trees (4)
  14. 2d Proceeding as planned (2,5)
  15. 3d Small units of time (12)
  16. 4d Hazardous (6)
  17. 6d Musical speed (5)
  18. 7d One employed to do odd jobs (8)
  19. 8d Percussion instrument (12)
  20. 12d Boldness (8)
  21. 15d Arrears of work (7)
  22. 16d Follow secretly (6)
  23. 18d Drunkard (5)
  24. 19d (Of sparkling wine) extremely dry (4)