"I think the diva is kind of a cliche. My definition of a diva is somebody whose talent does not match what they're trying to play, so all this temperament comes out"

Glenn Close is suggesting that the term "diva" is overused and has ended up being a cliche. She believes that a true queen is somebody whose talent does not match the role they are trying to play, and as an outcome, they end up being unstable. This could be due to a lack of confidence in their own abilities, or a sensation of being overwhelmed by the expectations of the role. It might likewise be a result of sensation underestimated or not taken seriously. Whatever the cause, the result is an individual who is overly remarkable and unstable. Close is suggesting that this is not a desirable trait, which it is not a sign of true skill.