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Large farms, after time, become allotments (7)

Ross

I believe the answer is:

ranches

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'large farms' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for ranches that I've seen before include "Large US farms" , "Farmsteads (USA)" , "18 down Large cattle farms" .)

I've seen this clue in The Irish Times.
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