Crossword Genius

Unit of area equal to 100 square metres (3)

Ross

I believe the answer is:

are

(Other definitions for are that I've seen before include "Exist; square measure" , "Is, in the plural" , "(We/they/you) exist" , "(We/you/they) exist" , "Era (anag.)" .)

I've seen this clue in The Mirror.
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