Crossword Genius

Mentioning Macbeth in a theatre, for instance (5)

Ross

I believe the answer is:

taboo

(Other definitions for taboo that I've seen before include "Prohibited as unclean or holy" , "(Irrational) prohibition" , "Beyond the pale" , "Anathema" , "Socially forbidden" .)

I've seen this clue in The Guardian.
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