Dispeller of evil has to be strangling monster (8)
I believe the answer is:
exorcist
'dispeller of evil' is the definition.
'to be strangling monster' is the wordplay.
'to be' becomes 'exist' ('exist' can be a synonym of 'be').
'strangling' indicates putting letters inside (I've seen this in other clues).
'monster' becomes 'orc' (I've seen this before).
'exist' placed around 'orc' is 'EXORCIST'.
'has' is the link.
(Other definitions for exorcist that I've seen before include "He drives the devil out by prayer" , "One who expels evil spirits" , "He'll remove it" , "One who supposedly drives out evil spirits" , "One who drives out evil spirits by prayer" .)