Crossword Genius

Be plural? (3)

Ross

I believe the answer is:

are

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This could be a double definition.

'be' is the first definition.
(I've seen this in another clue)

'plural?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for are that I've seen before include "Unit of land measure equal to 100 square metres" , "(We/they/you) exist" , "Era (anag.)" , "live" , "Is, in the plural" .)

I've seen this clue in the Evening Standard.
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