Actor's signal (3)

I believe the answer is:

cue

'actor's signal' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for cue that I've seen before include "line in speech" , "Snooker rod" , "Signal (to actor)" , "Actor's signal" , "Hint on stage" .)

I've seen this clue in the King Feature Syndicate, the USA Today, the Universal, the Evening Standard and The Times.

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