Jargon Christmas Cryptic Crossword

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Across
  1. 2. A-major, for instance – vital in business! (3)
  2. 4. Origins of chemistry, romantic maybe, can improve customer relationships? (1,1,1)
  3. 5. Beginnings of cramming instigate many a diploma? (1,1,1)
  4. 7. Straightening a tendon with final incantation instead of article (9)
  5. 8. Tending to make first move for healthy type of lifestyle (9)
  6. 9. Moment of truth to affect emotionally, showing nothing in measurement (10)
  7. 10. Standalone business unit that is isolated, halved and confused (4)
  8. 13. Pugilist’s pastime after midday meal is example of something said to be on trend (11)
  9. 16. Title denoting seniority? It’s in the adductors (4)
  10. 17.
  11. 18. …together, however, becomes online video (8) see XX
  12. 19. Err, confusing initial dram, port, with sailor coming back in damnation (4,3,4)
  13. 21. Contracting enjoyment of encircling deposit, we hear (11)
  14. 23. Purchasing detailed stakeholder engagement (3,2)
Down
  1. 1. Unexpected and possibly unwelcome area of knowledge – not right (4,5)
  2. 3.
  3. 6.
  4. 11.
  5. 12. Somebody motivated by support primarily and flatterers perhaps? Quite the opposite! (4-7)
  6. 14. Composer Philip, carrying out hermetic activity to the ear, limits career progression (5,7)
  7. 15. Crack squad to be French in glossy thing, returning (5,4)
  8. 20. Beating around every contact (5,3)
  9. 22. Give job to something audibly greater (4)