Trick-or-treater's haul (5)
I believe the answer is:
candy
'trick-or-treater's haul' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for candy that I've seen before include "American confectionary" , "Sweet (US)" , "American sweets" , "Crystallised sugar; US sweets" , "Girl's name (diminutive)" .)