You're out of spirits when he leaves (8)
I believe the answer is:
exorcist
'you're out of spirits when he leaves' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire 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" , "He'll remove it" , "He drives the devil out by prayer" , "One who expels evil spirits" , "One who drives out evil spirits by prayer" .)