I'm right out of sweeteners for drinks (7)
I believe the answer is:
imbibes
'for drinks' is the definition.
('imbibe' can be a synonym of 'drink')
'i'm right out of sweeteners' is the wordplay.
'right' becomes 'r' (common abbreviation).
'out of' suggests deleting specific letters.
'sweeteners' becomes 'bribes' (I've seen this before).
'bribes' with 'r' taken out is 'bibes'.
'im'+'bibes'='IMBIBES'
(Other definitions for imbibes that I've seen before include "Drinks (alcohol); absorbs (ideas)" , "Drinks, swallows" .)