Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a New air hostess (anag) — vessel's basic viability (13)
  2. 8a Mineral spring with health-giving properties (3)
  3. 9a Sky (9)
  4. 10a Blameless (8)
  5. 11a Prison (informal) (4)
  6. 13a Death-dealing (6)
  7. 14a False (6)
  8. 16a US tennis player with three grand slam singles titles, d. 1993 aged 49 (4)
  9. 17a Disclosed (8)
  10. 20a Spend freely (6,3)
  11. 21a Acknowledge (3)
  12. 22a Sydney's location (3,5,5)
  13. 1d Balls of rice with raw fish wrapped in seaweed (5)
  14. 2d Illegal (7,3,3)
  15. 3d Public functionary (8)
  16. 4d Irish county (6)
  17. 5d Terrible Russian ruler? (4)
  18. 6d List of those eligible to vote (9,4)
  19. 7d Released (3,4)
  20. 12d Current below the surface (8)
  21. 13d Go-between (7)
  22. 15d Start an operating system again (6)
  23. 18d Ridges of sand (5)
  24. 19d Scandinavian port city (4)