Crossword Genius

Very cold beer (6)

Ross

I believe the answer is:

bitter

This clue is a double definition.

'very cold' is the first definition.
(bitter informally can mean very cold)

'beer' is the second definition.
(bitter is a type of beer)

(Other definitions for bitter that I've seen before include "Sour taste or resentful" , "English beer, sounds sour" , "Causing unhappiness" , "drink" , "Hard to accept" .)

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