Crossword Genius

Possibly small drink? (4)

Ross

I believe the answer is:

beer

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This clue could be a double definition.

'possibly small' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

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

Can you help me to learn more?

(Other definitions for beer that I've seen before include "Drink flavoured with hops" , "Fermented alcoholic drink" , "Hopped drink" , "Perhaps bitter" , "Fermented alcoholic beverage" .)

I've seen this clue in the Evening Standard.
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