Adds up 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')
(Other definitions for tots that I've seen before include "Young children - shorts" , "Adds up like small children" , "Sailors' drams" , "Little children" , "Babies" .)