Crossword Genius

Om, say (6)

Ross

I believe the answer is:

mantra

(Other definitions for mantra that I've seen before include "Incantation used as aid to meditation" , "Repeated sacred word or words" , "Word or phrase repeated as aid to meditation" , "Sacred word for repetition" , "Word or phrase repeated as aid to concentration" .)

I've seen this clue in The Guardian.
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