Crossword Genius

Jaywalking, e.g. (4)

Ross

I believe the answer is:

nono

(Other definitions for nono that I've seen before include "Something not acceptaable" , "Non-starter (colloq.)" , "Something that must not be done (informal)" , "Failure (colloq.)" , "Unacceptable thing" .)

I've seen this clue in The Wall Street Journal.
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