Crossword Genius

Salty old drink? (4)

Ross

I believe the answer is:

grog

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This clue could be a double definition.

'salty old' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'drink?' is the second definition.
(grog is a kind of drink)

Can you help me to learn more?

(Other definitions for grog that I've seen before include "Sailors' drink of rum and water" , "Rum diluted with water" , "Old naval drink" , "Rum mixed with water" , "Drink of spirits mixed with water" .)

I've seen this clue in the Evening Standard.
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