___ Welles, director and producer of The Magnificent Ambersons (1942) (5)
I believe the answer is:
orson
(Other definitions for orson that I've seen before include "_____ Welles, director and star of "Citizen Kane"" , "-- Welles, director/actor" , "-- Welles, US director" , "- - Welles (actor)" , "-- Welles, film producer" .)