The phrase "a substantial actor" is correct and usable in written English.
It can be used to refer to someone or something that plays a significant role or has considerable influence in a particular context or situation.
Example: "In the recent negotiations, the company emerged as a substantial actor, shaping the outcome of the discussions."
Alternatives: "a significant player" or "a major contributor."
Thanks to Guinness's participation, "there wasn't a small character who wasn't a substantial actor himself," he said.
Then Ritt, who, after all, is a substantial actor in his own right and knows a thing or two about timing, delivers the speech that I believe he has been saving up for this moment: "Richard, I've had the last good lay in an old whore, and it had to be in front of the mirror".
Professor Dressler said, however, that the mere fact that Mr. Moussaoui was in jail at the time of the Sept. 11 attacks "would not by itself eliminate the possibility that prosecutors could show he was a substantial actor in the plot to kill".
Though known for his sure touch with light comedy, he also proved to be a substantial dramatic actor, winning an Academy Award for his role in Separate Tables (1958).
Advertisers are offering actors a substantial increase in fees in exchange for unlimited use of commercials.
Furthermore, the 'responsibility deals' at the heart of the government's health policy in England give corporate actors a substantial say in policies to improve the health status of the population (Department of Health 2011).
The report, which is released in updated form on Wednesday, says: "Rightwing extremists represent a substantial aspect of the lone actor threat and must not be overlooked".
After appearing in some 60 stage productions, the actor - already a substantial figure at 16 stone and 6ft 3in - was offered a film contract by Hal Roach.
Wacky "frat pack" comedian Will Ferrell stars and British up-and-comer Chiwetel Ejiofor has the distinction of being the first black male actor to get a substantial part in an Allen film.
Like so many of his characters, Mr. Wagner is fond of dropping names, and these pages are filled with celebrities both minor and major (a fictionalized version of the actor Michael Douglas plays a substantial role in the novel), and they jostle for space alongside the author's own creations.
An important point for Perloff to consider is that, while A.C.T. is indeed well-funded, has a highly-regarded MFA program for actors, and boasts a substantial subscription base, it's not the only game in town.
