Help to drink wine (7)
I believe the answer is:
support
'help' is the definition.
(I know this)
'drink wine' is the wordplay.
'drink' becomes 'sup' (to sup is to drink).
'wine' becomes 'port' (port wine is a kind of wine).
'sup'+'port'='SUPPORT'
'to' is the link.
(Other definitions for support that I've seen before include "Buttress" , "Champion" , "base" , "Help -- encourage" , "Maintain, back" .)