Church official gets rector initially on edge (6)
I believe the answer is:
verger
'church official' is the definition.
(type of church official)
'rector initially on edge' is the wordplay.
'rector initially' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'on' is a charade indicator (letters next to each other).
'edge' becomes 'verge' (verge is a kind of edge).
'r' after 'verge' is 'VERGER'.
'gets' is the link.
Can you help me to learn more?
(Other definitions for verger that I've seen before include "Church official" , "Church officer" , "Church caretaker and attendant" .)