Across:
   5. Where many have been shot and butchered, mostly outside (6)
   8. Showing wild exuberance ruined our cause, wasting energy (7)
  10. I may hunt bad people (8)
  11. Fetching fellow at 5, he is into Prog Rock (6)
  12. In pop cinema, mini deception: 22 9 suggests 27s' endings easy to endure (8)
  14. Time to break foolish truce with patrol boat (6)
  15. 5's product a partial reflection of dream life? (4)
  17. Witty, pretty girl captivates king (5)
  18. Very much immersed in Apostolic revolution (4)
  20. Ridiculous ad rubs the wrong way! (6)
  22. Miserable and exciting, one ending not imagined (8)
  25. She might take a swipe at 15 with car (Fiat, since every other one missing) (6)
  26. Accretions on pubis duly rectified, after last bit removed (8)
  27. 20 arrangement to die has music, yielding opening bits of 1 2 3 4 and chosen ending (7)
  28. Slips roller into sore bits (6)
Down:
   1. Moving way to operate: with anger! (6)
   2. Force Mary out (4)
   3. American coming up with garlic paste used in operations (8)
   4. A "Hot Lips" worked in this medical facility (8)
   6. Midnight sun: a mildly freakish natural event (7)
   7. It's ultimately needed with downpour (5)
   9. Part of 15 is seen by ears! (5)
  13. Parody of childish crap found in modern genre (5)
  16. Proud feature hammered out in man (8)
  17. Sordid act I consider embracing for moral instruction (8)
  19. He can be captivating, as the first one who talks (7)
  21. Poet in the ward? (5)
  23. Less experienced in ravine management (6)
  24. For a dare, some rascals try to fly under it (5)
  26. Broadcast first illuminating piece on TV showing what so many did in war (4)