Traditionally, amount of land plowable by one man in one day with a team of oxen (4)

I believe the answer is:

acre

(Other definitions for acre that I've seen before include "Old unit of area - old port" , "stretch of land" , "A state of W Brazil" , "Muslims here besieged" , "4840 sq yds" .)

I've seen this clue in the LA Times.

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