Farm measurement (4)

I believe the answer is:

acre

'farm measurement' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for acre that I've seen before include "Imperial land measurement" , "Four thousand, eight hundred and forty square yards" , "Unit of land area" , "amount of land" , "Imperial unit of area" .)

I've seen this clue in the Penny Press and The New York Times.

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