Unit of land measurement (4)

I believe the answer is:

acre

'unit of land measurement' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for acre that I've seen before include "0.405 of a hectare" , "A state of W Brazil" , "Measure of land area" , "4840 sq yds" , "Imperial unit of area" .)

I've seen this clue in The Guardian and the USA Today.

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