The term 'pause, on a music staff' can be represented by the crossword solution 'REST'. In music notation, a REST is a symbol that indicates a period of silence. It is used to indicate a pause in the music, and is usually represented by a hollowed out rectangle or oval shape. The length of the REST depends on the type of note it replaces, such as a whole REST for a whole note, a half REST for a half note, and so on.