As a holy man, he's superior (5)
I believe the answer is:
abbot
This might be a double definition.
'as a holy man he's' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'superior' is the second definition.
(abbot is a kind of superior)
Can you help me to learn more?
(Other definitions for abbot that I've seen before include "Head of a community of monks" , "Monks' superior" , "Head of religious house" , "Monastery chief" , "Convent leader, male" .)