Anaesthetic Christmas Crossword

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Across
  1. 2. Neil, perhaps, is fresh (5)
  2. 4. Trees for a club (4)
  3. 5. Brown after a sunbed session (3)
  4. 10. A number of people in theatre (12)
  5. 12. Significant scale for an officer (5)
  6. 14. Talk for a time regarding nominative determinism (4)
  7. 16. Barriers built by west with everyone heading south (5)
  8. 18. Animal runs quickly (4)
  9. 19. SW London region can shelter educational supervisor (6)
  10. 20. Souper model? (8)
Down
  1. 1. Doctor seen when rush goes on (7)
  2. 3. Solo learner loves neon (4)
  3. 4. Measures of power, or perhaps what's spoken aloud (5)
  4. 6. Average headless bloke invaded England (6)
  5. 7. Driver transporting goods has 'er cart overturned (6)
  6. 8. Ruler found in bakin' group or chess board (4)
  7. 9. Was not turning into Holmes's partner (6)
  8. 11. Blower found in nursery rhyme (6)
  9. 13. Group of rooms that sound delicious (5)
  10. 15. Scatter beam of sunshine after area loses hotshot (5)
  11. 17. Bright or not heavy (5)
  12. 21. This Consultant can be found doing an ad-lib anaesthetic update (5)