solve the anagram enter in crossword then name the connection

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Across
  1. 6. p root
  2. 7. halos
  3. 8. cater night
  4. 10. ogled
  5. 11. cool ny
  6. 12. news shreds
  7. 13. Dr he
  8. 14. err lab
  9. 15. sup rum
  10. 16. et elf
Down
  1. 1. redrum
  2. 2. ok flc
  3. 3. platter
  4. 4. egg gal
  5. 5. riped
  6. 7. Mr saw
  7. 8. set curl
  8. 9. uses bins
  9. 14. quo tube