Malt brew (4)
I believe the answer is:
beer
'malt brew' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for beer that I've seen before include "Fermented alcoholic beverage" , "Hop-flavoured drink" , "Drink using hops, malt, etc" , "See 4 down" , "Ale, lager etc" .)