Repeated phrase (6)
I believe the answer is:
mantra
'repeated phrase' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mantra that I've seen before include "Vedic hymn; slogan frequently repeated" , "Buddhist aid to concentration" , "Powerful words" , "Word repeated as aid to concentration during meditation" , "it's said to aid concentration" .)