One sent to relieve another of possessions? (8)
I believe the answer is:
exorcist
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for exorcist that I've seen before include "One who supposedly drives out evil spirits" , "One who expels evil spirits" , "He drives the devil out by prayer" , "He'll remove it" , "One who drives out evil spirits by prayer" .)