Definitions of cue:

noun: sports implement consisting of a tapering rod used to strike a cue ball in pool or billiards
noun: an actor's line that immediately precedes and serves as a reminder for some action or speech
noun: a stimulus that provides information about what to do
noun: evidence that helps to solve a problem
verb: assist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #15873)