Calm & Cryptic #1

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Across
  1. 2. sweet compromise (5)
  2. 4. with 14 across, writes opera in (we heard) soil vehicle? (8)
  3. 6. it's the end of messy, coy appeals (10)
  4. 11. transport a sickly bit of egg around the ocean, we hear? (9)
  5. 12. it's messy in the trunk - empty? (7)
  6. 13. celt came from school of note near Brazil (6)
  7. 14. with 4 across, writes opera in clay bunk (7)
  8. 16. number of people in a theatre (12)
  9. 18. raise a sign (5)
  10. 19. Japanese agony in some vitamins (5)
  11. 20. oat philosophy (3)
Down
  1. 1. push back leper (5)
  2. 3. lady's on a boat at Christmas, coming back (7)
  3. 5. unknown, female deer and car manufacturer, we heard, author together (4,6)
  4. 7. fruit skin (4)
  5. 8. charm some fourmis (7)
  6. 9. however, a lock of hair is an architectural feature (8)
  7. 10. he gains control; alcohol is not here physically (4,2,6)
  8. 15. she's twice the goddess (4)
  9. 17. furnish with electronic witticism (5)