Crossword Genius

Definite no-no (5)

Ross

I believe the answer is:

taboo

'definite no-no' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for taboo that I've seen before include "Ritual prohibition" , "(Irrational) prohibition" , "Socially forbidden" , "ruled out" , "Prohibited, sacred" .)

I've seen this clue in the Universal and the LA Times.
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