Second time heretic becomes bigoted (9)
I believe the answer is:
sectarian
'bigoted' is the definition.
(similar in meaning)
'second time heretic' is the wordplay.
'second' becomes 'sec' (synonyms).
'time' becomes 't' (abbreviation).
'heretic' becomes 'arian' (Arianism is a form of heresy).
'sec'+'t'+'arian'='SECTARIAN'
'becomes' is the link.
(Other definitions for sectarian that I've seen before include "Of a religious faction" , "from an unorthodox group" , "Adhering to a faction or doctrine" , "Ascertain to be with religious prejudice" , "Prejudiced against other religions? So ascertain" .)