Prolific drinker? (4)
I believe the answer is:
lush
I believe this is a double definition.
'prolific' is the first definition.
(I've seen this before)
'drinker?' is the second definition.
(I know that lush is a type of drunk)
(Other definitions for lush that I've seen before include "sponge" , "Prolific" , "Of grass, growing thick and strong" , "Fancy" , "Habitual drinker (slang)" .)