The Summer Crossword: A Song for Everyone

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Across
  1. 2. Coleridge narrator (7)
  2. 4. Leech, or Oscar-winning film? (4)
  3. 7. Timid (3)
  4. 10. Bone missing in babies (7)
  5. 12. Song for a professor (11)
  6. 14. Atomic-age diplomat, or type of cocktail? (7)
  7. 15. Caregiver, or pandemic hero? (5)
  8. 18. Freud's conscience (8)
  9. 20. Unaccompanied (5)
Down
  1. 1. Type of wave with very long wavelengths (5)
  2. 3. Senior clergyman (6)
  3. 4. Song for a crossword-solver (11)
  4. 5. What is to an MD, that is osteopathy is to a DO (9)
  5. 6. ____ of Sandwich (4)
  6. 8. Lie nobler (anagram) (9)
  7. 9. Song for a badly-trained musician (9)
  8. 11. Song for a math student (11)
  9. 13. Joe Biden's occupation (10)
  10. 16. "My pleasure" (6)
  11. 17. Admit (to), with "up" (4)
  12. 18. French greeting (5)
  13. 19. Killer whale (4)