To do this in, presumably requires brawn (6)

I believe the answer is:

muscle

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'brawn' is the definition.
(synonyms)

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

(Other definitions for muscle that I've seen before include "meat" , "Body tissue that effects movement" , "Body tissue - strength" , "Beef" , "elevator, for instance" .)

I've seen this clue in the Evening Standard.

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