Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Opportunities (7)
  2. 8a Element sharing an atomic number with another but with different physical properties (7)
  3. 9a Word made up of initial letters (7)
  4. 10a Own (7)
  5. 11a Register (5)
  6. 13a Appalling (9)
  7. 15a Heart chamber (9)
  8. 18a Disreputable — out of the sun (5)
  9. 21a Ship's windlass used for lifting heavy weights (7)
  10. 22a Small area off a kitchen (7)
  11. 23a Vocal vibrato — lot more (anag) (7)
  12. 24a No longer active (7)
  13. 1d Fad (5)
  14. 2d Clothes-drying frame (5)
  15. 3d Big blaze (13)
  16. 4d Silly smile (6)
  17. 5d Conker tree (5,8)
  18. 6d Regain consciousness (4,2)
  19. 7d Camera attachments (6)
  20. 12d Designation — reputation (4)
  21. 14d Second-hand (4)
  22. 15d Leave (a place previously occupied) (6)
  23. 16d Sibling's son (6)
  24. 17d Large American vulture (6)
  25. 19d Following (5)
  26. 20d Bring in — give up (5)