Bold supporter gets religion (6)
I believe the answer is:
brazen
'bold' is the definition.
(I've seen this before)
'supporter gets religion' is the wordplay.
'supporter' becomes 'bra' (a bra gives support to breasts).
'gets' says to put letters next to each other.
'religion' becomes 'zen' (Zen is an example).
'bra'+'zen'='BRAZEN'
(Other definitions for brazen that I've seen before include "Bold-faced" , "Shameless and bold - resembling brass" , "Impudent, shameless" , "Boldly impudent" , "Insolent, barefaced" .)