Crossword Genius

Something not allowed (5)

Ross

I believe the answer is:

taboo

(Other definitions for taboo that I've seen before include "(Irrational) prohibition" , "No-no" , "Forbidden for social reasons" , "Not allowed, forbidden, proscribed" , "Prohibited by religion or custom" .)

I've seen this clue in the Newsday.com and the Newsday.
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