"You are an ____ delinquent at times. Behave yourself, man!” (John Bercow, addressing Michael Gove) (12)

I believe the answer is:

incorrigible

(Other definitions for incorrigible that I've seen before include "Beyond correction" , "Beyond reform" , "Not able to be reformed" , "Not reformable" , "Firmly" .)

I've seen this clue in The Times.

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