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 Well-dressed (6)
  2. 4a Sweet — hedge — evade (5)
  3. 7a Non-metallic element, C (6)
  4. 8a Little box (of strawberries?) (6)
  5. 9a Thin flat circular object (4)
  6. 10a Excessively (2,1,5)
  7. 12a Overwhelmingly impressive (4-7)
  8. 17a Convalescence (8)
  9. 19a Bigness (4)
  10. 20a Idea (6)
  11. 21a Increase the value (6)
  12. 22a High-ranking Turkish officer (5)
  13. 23a Food that's hard to digest (6)
  14. 1d Arena (7)
  15. 2d Point of no return (which Caesar crossed in 49BC) (7)
  16. 3d PC (9)
  17. 4d Botch (5)
  18. 5d Legendary Spanish philanderer (3,4)
  19. 6d All of one's assets — 5-door car (6)
  20. 11d Adviser on personal problems (5,4)
  21. 13d Stirs up (7)
  22. 14d Covered (7)
  23. 15d Official newspaper (7)
  24. 16d Financial agreement in case of divorce made by a couple before marriage (abbr) (3-3)
  25. 18d Stringed instrument tuned lower than a violin (5)