Shrewd, as in the meat- packing business? (5)

I believe the answer is:

canny

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'shrewd' is the definition.
(both can mean having good judgement)

I can't explain the rest of the clue.

(Other definitions for canny that I've seen before include "Shrewd like Scotsman" , "Shrewd, knowing" , "Astute" , "Fly" , "Worldly-wise" .)

I've seen this clue in the Evening Standard.

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