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 Factional split (6)
  2. 4a Picasso's first name (5)
  3. 7a Containing iron (6)
  4. 8a Reload (anag.) (6)
  5. 9a Fruit made into wine, gin, jam and jelly (4)
  6. 10a Make more daring (8)
  7. 12a Total disaster (11)
  8. 17a Administrative capital of South Africa (8)
  9. 19a Keyboarding error (4)
  10. 20a Nonsense (6)
  11. 21a Total body of an author's work (6)
  12. 22a No dye (anag) (5)
  13. 23a Cup ('full of the warm South' in Keats's Ode to a Nightingale) (6)
  14. 1d Resin used to make varnish (7)
  15. 2d Yield from crops (7)
  16. 3d Heir (9)
  17. 4d City in north-west Portugal, noted for wine (5)
  18. 5d Scope (7)
  19. 6d Kind of rectangle (6)
  20. 11d Gondoliers' song (9)
  21. 13d Service — convenience (7)
  22. 14d Allocation by chance (3,4)
  23. 15d Large highly coloured butterfly (7)
  24. 16d Dug up with a shovel (6)
  25. 18d Body of water (5)