Some turn to gin (4)
I believe the answer is:
trap
'gin' is the definition.
(I've seen this in other clues)
'some turn' is the wordplay.
'some' becomes 'part' (only part of something).
'turn' is a reversal indicator.
'part' backwards is 'TRAP'.
'to' acts as a link.
(Other definitions for trap that I've seen before include "ladder" , "Snaring device" , "website?" , "Cakehole (slang)" , "that may be sprung?" .)