Goodbye Alexa!

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Across
  1. 3. black, green or white? (8)
  2. 6. centre of the universe (10)
  3. 8. how many Ge in one? (5)
  4. 10. pub? (3,4)
  5. 12. donuts and science (5)
  6. 13. avoid at all costs (6)
  7. 14. occupant of 11 (4,4)
  8. 16. steven doesn't know (5)
  9. 18. will they ever arrive (7)
  10. 19. post doc life instrument (9,8)
  11. 21. frustrated pair? (5)
  12. 22. tesco for chemicals (5,7)
  13. 23. main group flower (8)
Down
  1. 1. hit and miss playlist (8,8)
  2. 2. ____ says (5)
  3. 4. the bus is coming (5,4)
  4. 5. air free vessel (7)
  5. 7. least interesting research topic (8)
  6. 9. never lets you down playlist (4,6)
  7. 11. nmr dungeon (8)
  8. 13. 11 am (6)
  9. 15. four legged friend (6)
  10. 17. number one pen brand (8)
  11. 18. pray for rocks (7,3)
  12. 20. favourite element (3)