Halloween Hellscape

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Across
  1. 1. Halloween is mashed in a mash! (7)
  2. 4. Weep into pint below church (5)
  3. 5. No treats in here (3,2,6)
  4. 7. She's wrapped up in her kids! (9)
  5. 8. We heard fishmonger has 24 hour special? (3,4,4)
  6. 9. Gazing back I rest in peace, held by broken saint (6)
  7. 10. Legend's iron crows have no tail (5)
  8. 13. Demon stereotypes are cruel-hearted (7)
  9. 16. Angry researcher? (3,9)
  10. 17. Trickster's battle with hair on bottom (7)
  11. 18. Southern tribe at church - headless scream reveals predator (7,3)
  12. 22. Kills fish without success (6)
  13. 23. Fallen angel lived badly (5)
Down
  1. 2. Talks to ghosts of average size? (6)
  2. 3. Plot serious distance? (9)
  3. 6. Necromicon? Mysteriously I'm gorier (8)
  4. 11. Seer from early Bible thrown in cauldron (3,2,4)
  5. 12. "Shadows are we and like shadows depart" takes family for candle heart (7)
  6. 14. Singer ingests heroin for spooky hit (8)
  7. 15. Woodash circle goes dangerously dark (6)
  8. 19. Howler was multiplied and eats hungrily (8)
  9. 20. Sacrifice us for fancy dress (7)
  10. 21. Spiders home page for buying corn? (6)