Farm unit (4)

I think it could be either:

acre

bale

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

This is the entire clue.

(Other definitions for acre that I've seen before include "holy city" , "Imperial unit of area" , "Care about the piece of land" , "Care about this bit of land" , "4840 sq yds" .)

I've seen this clue in The Wall Street Journal, The New York Times, the Penny Press, the King Feature Syndicate and The Star Tribune.

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