super cool awesome crossword

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Across
  1. 4. merger as a first language
  2. 7. capt. stationed on Pianosa in Heller novel
  3. 8. merger as a trade language
  4. 9. no. of Swift album 14 after Healy?
  5. 11. Richard of physics fame
  6. 12. Discontinued US alcopop
  7. 16. Scottish rock band, 17. across said slangily
  8. 17. amorous, gon, math, rhythm prefix, derogatory
  9. 18. mackem slang for sweets, less child friendly slang elsewhere
  10. 19. Kant break these?
  11. 22. pig latin?
  12. 23. nag a ram, autologically in a way
  13. 24. digit of quantum computing
  14. 26. primate glass on many phones
  15. 28. ska, oft.
Down
  1. 1. in Marvel dialogue, oft.
  2. 2. je pense donc je suis, écrivain
  3. 3. sinister dir. on the map?
  4. 5. je pense donc je suis, initialement
  5. 6. compression
  6. 10. linguistic brew for short?
  7. 13. Hank Schrader's rocks
  8. 14. biblical greek
  9. 15. the very model of a ___
  10. 20. that which is hissed in Greek
  11. 21. sinister dir. in the ring?
  12. 25. second letter of the Hebrew alphabet
  13. 27. links comrade to camera
  14. 29. namesake of the horse