A drink we take in (4)
I believe the answer is:
wine
'a drink' is the definition.
(wine is an alcoholic drink)
'we take in' is the wordplay.
'take' is an insertion indicator.
'we' going around 'in' is 'WINE'.
(Other definitions for wine that I've seen before include "Accompaniment for women and song?" , "Alcoholic drink" , "See 18" , "Beaujolais, for example" , "Fermented grape juice" .)