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 Help (6)
  2. 4a Harass (5)
  3. 7a Temple built as a pyramidal tower with an upward curving roof (6)
  4. 8a Pre-decimal 2 shilling coin (6)
  5. 9a Long hard march (4)
  6. 10a Native American chief supposed to have had a lover called Minnehaha (Laughing Water) (8)
  7. 12a Use of an inappropriate, though similar-sounding, word (11)
  8. 17a Kind of purple colour (8)
  9. 19a Posted (4)
  10. 20a Small ape (6)
  11. 21a Type of shed (4-2)
  12. 22a Particular (5)
  13. 23a Large black diving duck (6)
  14. 1d Rearrangement of letters to form a new word (7)
  15. 2d Surface swimmer's tube (7)
  16. 3d Careless (4-5)
  17. 4d Under (5)
  18. 5d Continuous horizontal grey cloud (7)
  19. 6d Military helmet (informal) (3,3)
  20. 11d Relating to Jesus' 12 chief disciples (9)
  21. 13d Bitter in taste — harsh in tone (7)
  22. 14d Immediate — second (7)
  23. 15d Keep an eye on (7)
  24. 16d Put the phone down (4,2)
  25. 18d Nonsense (5)