Oona —, actress who played Zilpha Geary in 2017 BBC TV drama series Taboo (7)
I believe the answer is:
chaplin
(Other definitions for chaplin that I've seen before include "Charlie . . . . . . ., great clown of the cinema" , "Charles, early film actor and director" , "Comedian who wore baggy pants and bowler hat" , "Charles, film star and director" , "Charlie, immortal cinema clown" .)