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Black farm building time's forgotten (5)

Ross

I believe the answer is:

sable

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'black' is the definition.
(heraldic term for black)

I can't explain the rest of the clue.

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(Other definitions for sable that I've seen before include "Bales of rich fur" , "(Fur from) small carnivore" , "Black; antelope" , "Brush" , "Bales of valuable Russian fur" .)

I've seen this clue in The Times.
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