Deal with Halloween choice? (5)
I believe the answer is:
treat
This clue is a double definition.
'deal with' is the first definition.
(synonyms)
'halloween choice?' is the second definition.
(I've seen this in another clue)
(Other definitions for treat that I've seen before include "An indulgence; handle" , "Cure" , "Engage in negotiations" , "Nurse" , "Apply remedies" .)