Drink alcohol as a prop (7)
I believe the answer is:
support
'a prop' is the definition.
(I've seen this before)
'drink alcohol' is the wordplay.
'drink' becomes 'sup' (I've seen this before**).
'alcohol' becomes 'port' (port is a kind of alcohol).
'sup'+'port'='SUPPORT'
'as' is the link.
(Other definitions for support that I've seen before include "Buttress" , "strengthen" , "Hold up" , "Prop" , "comfort" .)