RLS Puzzler

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Across
  1. 7. German truffles, staff (6)
  2. 8. The face, pupil (6,7)
  3. 10. 999 no-one cared, staff. (5)
  4. 12. Disruptive genius, pupil (3,8)
  5. 13. Friendly cartoon bear who believes their own hype, pupil (6,5)
  6. 15. Curly Wurly business, staff (5)
  7. 16. Physics opera singer, staff (4)
  8. 17. Bins full of foam, subject (4,9)
  9. 19. Arty bird head missing scalpels, staff (8)
  10. 20. Equal to -273.15 degrees celsius and painful, pupil (6,2)
Down
  1. 1. Ink down farmer's shirt, pupil (11)
  2. 2. Too much fuss, subject (5)
  3. 3. English renegade master (once again), staff (7)
  4. 4. Apple core meets whiteboard, subject (9)
  5. 5. No flying birds with food, staff (5)
  6. 6. A race to eat lunch undetected, subject (6)
  7. 9. English gypsy, staff (4)
  8. 11. Chemistry hubbubb, staff (5)
  9. 14. Holding up a self-portrait while asking what the picture pertains to, subject (6)
  10. 18. Tired of endless dot matrix printouts, staff (6)