Bit player (5)
(Other definitions for actor that I've seen before include "Gielgud, say" , "Theatre player" , "One in a play" , "Theatrical performer" , "One with role" .)
(Other definitions for extra that I've seen before include "Supplemental" , "outside" , "Bolt-on" , "Bit player in film" , "Way of scoring at cricket" .)