Adds up for the drinks (4)
I believe the answer is:
tots
I believe this clue is a double definition.
'adds up' is the first definition.
('tot' can be a synonym of 'add up')
'the drinks' is the second definition.
(I have seen 'Little drinks' mean 'tots' so perhaps 'drinks' could also mean 'tots')
'for' is the link.
(Other definitions for tots that I've seen before include "Party drinks" , "Adds up like small children" , "Young children - shorts" , "Little drinks" , "Finds the sum" .)