Ambassador, legate (8)
I believe the answer is:
emissary
I believe this clue is a double definition.
'ambassador' is the first definition.
(I've seen this in another clue)
'legate' is the second definition.
(I've seen this before)
(Other definitions for emissary that I've seen before include "Spy" , "Government messenger" , "Diplomat sent on special task" , "Person sent to negotiate" , "Agent possibly" .)