Associated with gin, it’s mostly rum (5)

I believe the answer is:

rummy

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'rum' is the definition.
('rummy' can be a synonym of 'rum')

I don't understand the remainder of the clue.

(Other definitions for rummy that I've seen before include "Gin perhaps?" , "with an alcoholic taste?" , "game of cards" , "Peculiar - card game" , "Set, sequence card game" .)

I've seen this clue in the Evening Standard.

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