Crossword Genius

Drink to exist for queen (4)

Ross

I believe the answer is:

beer

'drink' is the definition.
(beer is a kind of drink)

'exist for queen' is the wordplay.
'exist' becomes 'be' ('be' can be a synonym of 'exist').
'for' says to put letters next to each other.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'be'+'er'='BEER'

'to' acts as a link.

(Other definitions for beer that I've seen before include "It may be 13 across-ed!" , "pint" , "Fermented malt and hops" , "Hop drink" , "Hop-flavoured drink" .)

I've seen this clue in The Mirror.
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