Drink left aboard (4)

I believe the answer is:

port

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'drink' is the first definition.
(I know that Port is a type of Portuguese wine)

'left aboard' is the second definition.
'port' can be an answer for 'left' (left side of a ship - opposite of starboard). I am not sure about the 'aboard' bit.

Can you help me to learn more?

(Other definitions for port that I've seen before include "Dessert wine" , "Sweet red wine for after dinner" , "After-dinner wine" , "Left side of ship - red wine" , "Anchorage" .)

I've seen this clue in The Irish Independent.

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