Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Protective panel behind sink or cooker (10)
  2. 7a Hard feelings (7)
  3. 8a Durable cotton fabric (5)
  4. 10a Nourish (4)
  5. 11a A spinner's delivery? (3,5)
  6. 13a Paving stone — mend shoes (6)
  7. 15a Piano (rhyming slang) (6)
  8. 17a One who sings the praises of another (8)
  9. 18a Use e-cigarettes (4)
  10. 21a Taut (5)
  11. 22a Infuriated (7)
  12. 23a Scottish queen who fled to England and was executed 1587 (4,6)
  13. 1d As (5)
  14. 2d Behold! (4)
  15. 3d Dissension (6)
  16. 4d Devastating event (informal) (4,4)
  17. 5d Anxious feeling (7)
  18. 6d Skilled (10)
  19. 9d Atone (4,6)
  20. 12d A little (8)
  21. 14d North Italian city, home to the world's oldest university (7)
  22. 16d Stance (anag) (6)
  23. 19d Anxiety (5)
  24. 20d Either of the Bear constellations (Major or Minor) (4)