Drink in Bull's Head, always before time (8)
I believe the answer is:
beverage
'drink' is the definition.
('beverage' can be a synonym of 'drink')
'bull's head always before time' is the wordplay.
'head' says to take the initial letters.
'always' becomes 'ever' ('ever' can be a synonym of 'always').
'before' is a charade indicator (letters next to each other).
'time' becomes 'age' (age is a kind of time**).
The first letter of 'bulls' is 'b'.
'b'+'ever'+'age'='BEVERAGE'
'in' is the link.
(Other definitions for beverage that I've seen before include "such as a Frappuccino" , "Tea, say" , "Drink other than water" , "Liquid for drinking" , "Liquid refreshment" .)