scenesetter

From scene +‎ setter.

scenesetter (plural scenesetters)

1. One who, or that which, sets the scene.
   • 1986, Michael Shaun Rochemont, Focus in Generative Grammar, page 58:

     To be pragmatically determined, it must be the case that the expression does not contribute new information to the structure of the discourse except as an unremarkable scenesetter.