Supernatural being tormented priest (6)
I believe the answer is:
sprite
'supernatural being' is the definition.
(sprite is a kind of supernatural being)
'tormented priest' is the wordplay.
'tormented' indicates an anagram.
'priest' with letters rearranged gives 'SPRITE'.
(Other definitions for sprite that I've seen before include "water pixie" , "Dainty type" , "Elf, fairy" , "sports car" , "Impish type" .)