Snare leader of party to leave same statement repeatedly (6)
I believe the answer is:
mantra
'same statement repeatedly' is the definition.
(repeated phrase or slogan)
I don't understand the remainder of the clue.
(Other definitions for mantra that I've seen before include "Incantation, Hindu psalm" , "Words repeated as an aid to meditation" , "words of comfort repeatedly" , "Hindu word or phrase as aid to meditation" , "Buddhist chant" .)