Salty old drink? (4)
I believe the answer is:
grog
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" .)