Definitions:
a thing said or done that serves as a signal to an actor or other performer to enter or to begin their speech or performance

a facility for playing through an audio or video recording very rapidly until a desired starting point is reached.

give a cue to or for

set a piece of audio or video equipment in readiness to play (a particular part of the recorded material)

a long straight tapering wooden rod for striking the ball in snooker, billiards, etc.

use a cue to strike the ball