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 Slow on the uptake (6)
  2. 4a Clear-headed (5)
  3. 7a Proust (anag) – daze (6)
  4. 8a Outbid another would-be (home) buyer (6)
  5. 9a Road de-icer (4)
  6. 10a Emphatically (2,6)
  7. 12a Superficial, routine (11)
  8. 17a Antiquated – loo beset (anag) (8)
  9. 19a One might be sued over this (4)
  10. 20a Unfriendly – and cold! (6)
  11. 21a Screw up one's eyes (6)
  12. 22a Search (through) (5)
  13. 23a Legal documents (6)
  14. 1d Exposed rock (7)
  15. 2d One aims to pick a winner (7)
  16. 3d Bondage – riveted us (anag) (9)
  17. 4d Rogue (5)
  18. 5d Round rock (7)
  19. 6d (Formal) meal (6)
  20. 11d One takes over (9)
  21. 13d Slow down (4,3)
  22. 14d Stand out (7)
  23. 15d 23 for men (1-6)
  24. 16d Place to keep valuables (6)
  25. 18d 1,000 cubic centimetres (5)