Crossword Genius

Forbidden action (4)

Ross

I believe the answer is:

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

I've seen this clue in the Penny Press, the Newsday, The New York Times and the USA Today.
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