Indicate there's some wine to finish off (7)
I believe the answer is:
portend
'indicate' is the definition.
(portending is a kind of indicating)
'there's some wine to finish off' is the wordplay.
'there's' means one lot of letters go next to another.
'some wine' becomes 'port' (port is a kind of wine).
'to finish off' becomes 'end' (to finish is to come to an end).
'port'+'end' is 'PORTEND'.
(Other definitions for portend that I've seen before include "Betoken; presage" , "Herald" , "Give warning" , "Omen" , "Threaten" .)