Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Showing no emotion (5-5)
  2. 7a Hindu religious symbol appropriated by Nazis (8)
  3. 8a Wading bird with spindly legs and long neck and bill (4)
  4. 9a Strap used to control horses (4)
  5. 10a Habits (7)
  6. 12a The upper classes (4,7)
  7. 14a Swimmer's breathing device (7)
  8. 16a Translucent mineral used as a gemstone (4)
  9. 19a Animal excrement (4)
  10. 20a eg Handel's Messiah (8)
  11. 21a City on the Neckar, home to Germany's oldest university (10)
  12. 1d Strength (5)
  13. 2d Smooching (7)
  14. 3d Surprise attack (4)
  15. 4d South-west Mexican resort (8)
  16. 5d Decree (5)
  17. 6d Without wavering (6)
  18. 11d Celestial body (8)
  19. 12d Pay homage to (6)
  20. 13d Investigate (7)
  21. 15d Scoundrel (5)
  22. 17d Prone or supine? (5)
  23. 18d Fall short (4)