DARC Christmas Crossword

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Across
  1. 7. Things get quickly out of hand (5,2,14)
  2. 8. Should write a paper with Law (7)
  3. 9. Use this to force a constraint (8,10)
  4. 11. Should write a paper with Song (5)
  5. 13. Constantly bigoted (6)
  6. 16. Sade's favourite mathematical object (9,8)
  7. 17. Wife of POTUS #40 (5)
  8. 18. Found inside nuts and integrals (7)
  9. 19. A x=lambda x (lambda) (10)
  10. 20. Changes from one day to the next (4,9)
  11. 21. Model that sounds like precious stones (5)
Down
  1. 1. Come to the answer bit-by-bit (11)
  2. 2. Corpuscle a bit like an ensemble member (8)
  3. 3. The "W" in S-M-W (8)
  4. 4. Data assimilation term that's frankly a bit rude (9)
  5. 5. Musical group (8)
  6. 6. Systematic collection of elements (6)
  7. 10. Rows to columns (9)
  8. 12. Whoops! (5)
  9. 14. Doesn't go far (9)
  10. 15. Data assimilation author who had fun seven days a week (5,5)