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 Decorated with bands (7)
  2. 8a Hard silvery-white metal used in alloys with platinum, Rh (7)
  3. 9a Truth (7)
  4. 10a Time out (7)
  5. 11a Shanghai's underground system (5)
  6. 13a Porter's lodge (9)
  7. 15a According to a strict interpretation of the rules — I catch Len (anag) (9)
  8. 18a Unbusy bee? (5)
  9. 21a Place to find a surprise gift (4,3)
  10. 22a Red panda — cabaret (anag) (7)
  11. 23a Unsophisticated (7)
  12. 24a Optic relief (3-4)
  13. 1d Jostling mass of people (5)
  14. 2d Undergo a chemical change (5)
  15. 3d Right of succession belonging to the eldest child (13)
  16. 4d Try rod (anag) (3,3)
  17. 5d Well-known public figure (9,4)
  18. 6d Social circle (6)
  19. 7d Hamper (6)
  20. 12d River rising in the Czech Republic and flowing into the North Sea at Cuxhaven in Germany (4)
  21. 14d Steer clear of (4)
  22. 15d Syphoning equipment (6)
  23. 16d Morally pure (6)
  24. 17d Bit of old road? (6)
  25. 19d O — Wilde (5)
  26. 20d Finish what's on the plate (3,2)