superagent

/ˈsupərˌeɪdʒənt/
noun
  1. A very successful or powerful agent, especially in sports, entertainment, or real estate, who represents high-profile clients.
    • She became a superagent in Hollywood by representing several Oscar-winning actors.
    • The real estate superagent sold over a billion dollars in properties last year.
    • The superagent negotiated a record-breaking contract for the star athlete.