Agent sent on a secret mission (8)

I believe the answer is:

emissary

(Other definitions for emissary that I've seen before include "Messenger, envoy" , "Someone sent on a mission" , "Legate" , "One sent" , "Government agent" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.