Drink alongside empty barrel is wine (7)
I believe the answer is:
chablis
'wine' is the definition.
(Chablis is an example)
'drink alongside empty barrel is' is the wordplay.
'drink' becomes 'cha' (cha can mean tea).
'alongside' says to put letters next to each other.
'empty' suggests removing the centre.
'barrel' with its middle taken out is 'bl'.
'cha'+'bl'+'is'='CHABLIS'
(Other definitions for chablis that I've seen before include "Drink" , "French dry white wine" , "Dry Burgundy wine" , "Burgundy town and white wine" , "Town in north central France noted for white Burgundy wines" .)