Repeated words, a part of human tradition (6)
I believe the answer is:
mantra
'repeated words' is the definition.
(I've seen this before)
'a part of human tradition' is the wordplay.
'a part of' says the answer is hidden in the clue.
'MANTRA' can be found hidden inside 'human tradition'.
(Other definitions for mantra that I've seen before include "Word or phrase repeated as aid to meditation" , "Chanted words" , "Watchword" , "Phrase repeated as aid to meditation in Buddhism" , "Special word or phrase used in Buddhist meditation" .)