"Citizen Kane" director Welles (5)
I believe the answer is:
orson
'citizen kane director welles' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for orson that I've seen before include "-- Welles, US director" , "- - Welles (films)" , ". . . . . Welles, creator of film ''Citizen Kane''" , "-- Welles, film producer" , "Film director so-called" .)