Crossword Genius

Banned practice (5)

Ross

I believe the answer is:

taboo

(Other definitions for taboo that I've seen before include "Prohibited as unclean or holy" , "Inhibition based on social custom" , "Socially forbidden" , "Prohibited; ban" , "Not allowed, forbidden, proscribed" .)

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