Opening wine (4)

I believe the answer is:

port

I believe this clue is a double definition.

'opening' is the first definition.
(port is a kind of opening)

'wine' is the second definition.
(port is a kind of wine)

(Other definitions for port that I've seen before include "E.g. five [SWANSEA]" , "Larboard, formerly" , "Bordeaux, say" , "Opposite of starboard" , "Wine left at sea ?" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app