Briefly hunting after Long Island cattle (8)

I believe the answer is:

limousin

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'cattle' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for limousin that I've seen before include "French district" , "French breed of cattle" , "Cow" , "Kind of stock" .)

I've seen this clue in The Guardian.

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