Repeated words of claimant, rambling (6)
I believe the answer is:
mantra
'repeated words' is the definition.
(I've seen this before)
'of claimant rambling' is the wordplay.
'of' indicates a hidden word.
'MANTRA' can be found hidden inside 'claimant rambling'.
(Other definitions for mantra that I've seen before include "Word or sound to aid meditation" , "Word aiding meditation (Buddhism)" , "Special word or phrase used in Buddhist meditation" , "words of comfort repeatedly" , "it's said to aid concentration" .)