Happy Birthday Old Sport

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Across
  1. 5. Arthurian city was once real, but rather messy (8)
  2. 6. American bottom an enthusiast of Sam Young’s back garden (5)
  3. 8. At first, mysterious occurrences troubled hikers - maybe a notorious cryptid? (7)
  4. 10. Pol’s favourite accessory? It’s made by an ancien régime banker, bossman (11)
  5. 12. Autistic, or does he just wear glasses? (6)
  6. 13. Swiss preacher, acquiring nothing, becomes a divisive Italian author (7)
  7. 14. Dune author is a foolish man (7)
  8. 15. Bag Falstaff’s favourite drink (4)
Down
  1. 1. Large, hip guy is a Panther, perhaps (3, 3)
  2. 2. French sculptor, surrounded by ghostly noise? That’s a pyrrhic victory (8)
  3. 3. Try and equal lengthy cricket format (4, 5)
  4. 4. Genocidal Adolf transforms into a dashing dictator (7, 7)
  5. 7. Be quiet, then study an eccentric Alcester resident (6)
  6. 9. Postgraduate friends found within that smart, hot Sheffield crowd (5)
  7. 11. If twin is upset, they become dystopian police officer (6)
  8. 12. Maya Angelou, US, gets flustered and loses two articles but becomes a talented writer (6, 5)