Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Arctic permafrost region (6)
  2. 4a Eagerly absorb (3,2)
  3. 7a Set-to (informal) (4-2)
  4. 8a Partisan (6)
  5. 9a Equitable (4)
  6. 10a Drive out (8)
  7. 12a Incompatible (3-8)
  8. 17a Struggle awkwardly (8)
  9. 19a Hilltop (4)
  10. 20a Seeds used to make tahini (6)
  11. 21a Strengthened opening for a lace (6)
  12. 22a Become widespread on social media (5)
  13. 23a Suppose (6)
  14. 1d Sea wave caused by an earthquake (7)
  15. 2d Instinctive (7)
  16. 3d Inhibited (9)
  17. 4d Moon-related (5)
  18. 5d Nutty confectionery (7)
  19. 6d Hotel or hospital employee (6)
  20. 11d Old US rose (anag) — without scent (9)
  21. 13d Once-over (informal) (4-3)
  22. 14d Theatrical group of motionless figures (7)
  23. 15d Bishop's patch (7)
  24. 16d Balance (6)
  25. 18d Known as (5)