In certain ways, I'm shrewd (4)

I believe the answer is:

wise

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'shrewd' is the definition.
(thesaurus)

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

(Other definitions for wise that I've seen before include "Old way" , "Having good judgment or common sense" , "` `A word to the .... is enough' '" , "Showing sagacity" , "Having good judgement" .)

I've seen this clue in the Evening Standard.

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