A member of the clergy's official list (5)
I believe the answer is:
canon
'a member of the clergy's' is the definition.
(type of clergyman)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for canon that I've seen before include "Member of the clergy" , "accepted criterion" , "set of books" , "Such literary works are genuine" , "priest for cathedral duties" .)