CUE

anything serving as a signal to do something. —Freedom Congress Glossary (approved 5-9-90)

anything serving as a signal to do something.anything serving as a signal to do something. The British people should take up a collection and buy this office back, and that's the aliens office, and - the aliens office of Great Britain - and they've taken their cue from the Immigration Office of the Department of Injustice and they're pretty ornery. - Tone 40 on an Object (6 July 1957)