Trick or Treat

a cryptic puzzle by Emily Cox and Henry Rathvon

Every clue answer involves a "trick" (having its letters anagrammed to make a new word entered in the grid) or a "treat" (being given an extra letter to make a new word entered in the grid). There are 20 "trick" words and 20 "treat" words; answer lengths have been omitted to keep each type disguised until its clue has been solved.

There are four proper nouns among clue answers and four among diagram entries.

Across

  • 1.
    Halloween costumes to bear (5)
  • 5.
    Set fire to land (5)
  • 10.
    Afterthought about angry buccaneers (7)
  • 11.
    Part of troupe running by (3)
  • 12.
    Poor sense of pitch makes musical note approximate (two words) (3,3)
  • 13.
    Name adopted by cagey actor (6)
  • 14.
    Frees Utes in revolts (6)
  • 16.
    'Team expressed sorrow to audience (4)
  • 18.
    Opera singer makes eager return (4)
  • 19.
    Splattered tar gets outhouse ruined (7)
  • 23.
    $1000 notice returned to Spanish noblemen (8)
  • 26.
    Fly around left of the sun (5)
  • 28.
    Audibly cut fruit (4)
  • 29.
    Flower rates poorly (5)
  • 32.
    Like a silly goose eating small nuts (6)
  • 33.
    Material in Conrad novel (6)
  • 34.
    Lennon's love is performing nothing (3)
  • 35.
    Incline to like money (6)
  • 36.
    Set out twice to fly (6)
  • 37.
    Answer about the Greek city (6)

Down

  • 1.
    Model's back framed by a right painter (6)
  • 2.
    Almost obliterate Times (4)
  • 3.
    Bridle makes horse's head change (6)
  • 4.
    Stick on eastern tree (4)
  • 5.
    Rich woman's parents (7)
  • 6.
    Make a record of some lumber (3)
  • 7.
    Get retribution for England in prayer (6)
  • 8.
    Professor has hot drink with pop singer (7)
  • 9.
    University in Georgia offers drawing (5)
  • 14.
    Black shabby bales (5)
  • 15.
    Many an authority falls, we hear (6)
  • 17.
    Farmer gives vegetables to colony member (7)
  • 20.
    Water bird swallows one drug (6)
  • 21.
    Perches Haley novel around front of shelf (6)
  • 22.
    Pets around red wagons (5)
  • 24.
    Andre wandering in old forest (5)
  • 25.
    Notices shortstop bearing big belly (5)
  • 27.
    Bind large tree (4)
  • 30.
    Tidy trap catches one (4)
  • 31.
    Put on an English professor (3)