Maybe gin duty is raised (4)
I believe the answer is:
trap
'maybe gin' is the definition.
(gin is a type of trap)
'duty is raised' is the wordplay.
'duty' becomes 'part' (part is a kind of duty).
'is raised' shows that the letters should be reversed in order (going up in a down clue).
'part' reversed gives 'TRAP'.
(Other definitions for trap that I've seen before include "Part of a snare" , "website?" , "Confine" , "Kisser" , "Golfing hazard" .)