An actor or performer who takes the focus of the audience away from the other actors on stage by positioning him- or herself in such a way that the other actors' backs are to the audience. Everyone said after the show that his performance was riveting, but to be honest, I think he's just a back-cloth star. He made it so he was the only one we could ever see!
See also: star
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.