A trap for the drinker (3)
I believe the answer is:
gin
'a trap' is the definition.
(gin is a kind of trap)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gin that I've seen before include "Machine for separating cotton from its seeds" , "Animal trap or alcoholic drink" , "Strong drink - trap" , "Liquor flavoured with juniper berries" , "Juniper-flavoured spirit" .)