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Grouse and cattle reared for their meat (4)

Ross

I believe the answer is:

beef

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'grouse' is the definition.
(synonyms)

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

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(Other definitions for beef that I've seen before include "See 24" , "Strength - grievance" , "Complaint; strength" , "Muscle; meat; grievance" , "Brawn; complaint" .)

I've seen this clue in The Sunday Times and The Times.
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