Port, for one (4)
I believe the answer is:
wine
'port for one' is the definition.
(I know that Port wine is a type of fortified wine)
This is the entire clue.
(Other definitions for wine that I've seen before include "Eg, Bordeaux" , "Accompaniment for women and song?" , "Red, white or rose?" , "Rich red" , "See 18" .)