Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a Leave (a job) voluntarily (6)
  2. 4a Cheerful and light-hearted (6)
  3. 9a Fanciful musing (7)
  4. 10a Problem — children (5)
  5. 11a Constant (5)
  6. 12a Mundane (7)
  7. 13a Completely settled — simple and easy to understand (3,3,5)
  8. 18a Producing a reasonable amount of money (7)
  9. 20a Main impact of, say, an attack (5)
  10. 22a Off-white colour (5)
  11. 23a Greedy guts (7)
  12. 24a Expensive fur once used to decorate robes worn by royalty, peers and judges on state occasions (6)
  13. 25a Document proving who you are (2,4)
  14. 1d Very seldom (6)
  15. 2d Hotel — cabbage (5)
  16. 3d Largest of the great apes (7)
  17. 5d Addictive narcotic derived from a poppy (5)
  18. 6d Sudden increase (7)
  19. 7d Prone to 9? (6)
  20. 8d System followed in a particular discipline (11)
  21. 14d Unvarying (7)
  22. 15d Spring back (7)
  23. 16d Catch fire (6)
  24. 17d High (informal) (6)
  25. 19d Swashbuckling Hollywood star Errol ___ , d. 1959 (5)
  26. 21d Far beyond the average (5)