Docte, callide; cleverly done (eg Terence Andria 183) (6)

I believe the answer is:

astute

(Other definitions for astute that I've seen before include "Shrewd, canny" , "Able to make accurate assessments" , "Sharp-witted" , "Sharp, shrewd" , "Peerceptive" .)

I've seen this clue in The Times.

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