Cryptic 31026 by Jester

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Across
  1. 4. Marriage in Milan steals the hearts of Xmas strip among lions. (10)
  2. 9. A cosy starship is faulty science. (12)
  3. 11. A frog store messed up the summer festivity. (10)
  4. 12. Bird or book? That takes the biscuit! (7)
  5. 14. A beauty contest judge? Capital! (5)
  6. 15. Print buried by squirrel in obscurity. (4)
  7. 16. Dance! Dance in front of the alien. (6)
  8. 17. A building block's heavy weight heard at the end of Victoria. (7)
  9. 20. French green tea removed - an opening drink. (8)
  10. 23. Paper satchels messed up the party game. (4,3,6)
  11. 25. Board member? A revolutionary given direction. (6)
  12. 27. City lawyers defeated with one stone. (4,3,4)
  13. 28. Scary singer and a meeple, oddly. (3)
  14. 29. An argument to be backed into dried fruit. (6)
  15. 30. The Lady's companion hoarding wedding bands? Epic fantasy! (4,2,3,5)
Down
  1. 1. Orchestra featured in triumph for volleyball. (6)
  2. 2. A thousand embraced by cash is a head-scratcher for an evergreen. (6,6)
  3. 3. A mother rodent! Darling, run! (8)
  4. 5. Phallic Gary takes a twist to produce writing. (11)
  5. 6. Woodwind is fashionable in Bordeaux red. (8)
  6. 7. Most of the Chinese haul back Korean characters. (6)
  7. 8. Small pickles blow the tops off acorn rich dons. (10)
  8. 10. Top tier **** has begun alternative exercise in town up north. (10)
  9. 13. A German greets a headless 10 year old - it'll be a spooky evening! (9)
  10. 18. Royal rascal to the East turns up hideout. (9)
  11. 19. Peter or John's labours surround something fishy — that's the plant. (10)
  12. 21. Obscure subject, even Niall can't see it. (4,6)
  13. 22. When ascending, grip, and replace loser with an arm or a leg. (8)
  14. 24. Region involved in a cactus. Canyons everywhere. (7)
  15. 26. Old flame Peter lost his head over city. (6)