Superman traditionally uses this phrase (6)
I believe the answer is:
mantra
'this phrase' is the definition.
(I have seen 'Chanted phrase ' mean 'mantra' so perhaps 'phrase' could also mean 'mantra')
'superman traditionally uses' is the wordplay.
'uses' indicates the answer is hidden within the clue (the answer is used as part of the clue).
'MANTRA' can be found hidden inside 'superman traditionally'.
(Other definitions for mantra that I've seen before include "Buddhist chant" , "Word or phrase repeated as aid to meditation" , "Incantation used as aid to meditation" , "Oft-repeated slogan or phrase" , "word to help concentration" .)