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 Weak person (informal) (6)
  2. 4a Confused sounds (5)
  3. 7a Film star in The Iron Lady, b. 1949 (6)
  4. 8a Small fry (6)
  5. 9a Europe's highest active volcano (4)
  6. 10a Wipe out a large number (8)
  7. 12a Thrilling in effect (11)
  8. 17a Italian aristocrat (8)
  9. 19a Proverbially, brass can be found beside this (4)
  10. 20a Not dressed (6)
  11. 21a Hard to understand (6)
  12. 22a Choose (5)
  13. 23a Resist (6)
  14. 1d Changes into something else (7)
  15. 2d Get ready (7)
  16. 3d Speeds up (9)
  17. 4d Pancakes served with sour cream (5)
  18. 5d Brightly coloured neckerchief (7)
  19. 6d Modest — restrained (3-3)
  20. 11d Thrilled to bits (4-1-4)
  21. 13d Distinctive elegance (7)
  22. 14d Pain in the lower back (7)
  23. 15d What, say, Howard Hughes became (7)
  24. 16d From Liverpool? (6)
  25. 18d Precise (5)