43.

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Across
  1. 1. It's about old currency notes (7)
  2. 3. GRASS Crazy King George behind American plant (3-5)
  3. 5. Old dinasaur from Craggy Hill behind Knock (6)
  4. 7. Hit mound behind junction (5)
  5. 9. Sets up sailor bar in American city with first cousin - a man-eater (8)
  6. 11. It's about former times and a meal we enjoyed then (6)
  7. 12. Youngster with ape developed a pulse (8)
  8. 15. One hour with ape misbehaving is a delight (8)
  9. 18. Clean up what's beneath and behind American city (7)
  10. 19. NETWORKS Old connections?
  11. 20. Finishes with alternative comic and works in The Garden with mimics (6)
  12. 22. Lack of flesh? Not so much, when it's about former queen (8)
  13. 23. Listen to writer going to American city with worthless old money (8)
  14. 24. It's about old message to renew old connections (6)
Down
  1. 2. Bird approaches hill behind American city with mimic (8)
  2. 4. Part of hunt to persecute someone behind American news (8)
  3. 6. Colonise Pluto with ape, perhaps (8)
  4. 8. GEAR Special equipment for police in South American city with great rampaging (4,4)
  5. 10. ALL In spite of everything, being behind American lines
  6. 13. Gather outside South American city with lower ranking (8)
  7. 14. Wall provided a role with mimic in it
  8. 16. Renew old school ties
  9. 17. Two presidents behind American attacks (8)
  10. 21. Little weight behind American news report (8)