Priest getting rid of possessions? (8)
I believe the answer is:
exorcist
'priest getting rid of possessions?' is the definition.
(an exorcist helps someone who is possessed)
This is all the clue.
(Other definitions for exorcist that I've seen before include "He drives the devil out by prayer" , "One who supposedly drives out evil spirits" , "One who expels evil spirits" , "He'll remove it" , "One who drives out evil spirits by prayer" .)