Who lives for drink? (4)
I believe the answer is:
beer
'for drink?' is the definition.
(beer is a kind of drink)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for beer that I've seen before include "Fermented alcoholic beverage" , "See 4 down" , "Brewery product" , "Hopped drink" , "... this at pub?" .)