Papal messenger (6)
I believe the answer is:
legate
'papal messenger' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for legate that I've seen before include "Envoy representing the Pope" , "Vatican emissary" , "Envoy - pope's representative" , "Papal envoy from Galtee" , "messenger for the Pope" .)