Crossword Genius

___ no good (misbehaving) (4)

Ross

I believe the answer is:

upto

(Other definitions for upto that I've seen before include "Capable of or engaged in" , "Pout being occupied with" , "Motorcade escort" , "As many as, though no more" , "To the time that" .)

I've seen this clue in The New York Times.
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