Wizard angrier about Church resistance (8)
I believe the answer is:
sorcerer
'wizard' is the definition.
(I know that wizard can be written as sorcerer)
'angrier about church resistance' is the wordplay.
'angrier' becomes 'sorer' ('sore' can be similar in meaning to 'angry').
'about' is an insertion indicator.
'church' becomes 'CE' (Church of England).
'resistance' becomes 'r' (electronics abbreviation).
'ce'+'r'='cer'
'sorer' going around 'cer' is 'SORCERER'.
(Other definitions for sorcerer that I've seen before include "Potter, say" , "Magician with musical apprentice" , "Magician aided by evil spirits" , "Male magician, wizard" , "In stories, he has magical powers that he uses to harm others" .)