People waiting, we’re told, for a signal (3)

I believe the answer is:

cue

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'for a signal' is the definition.
(as in an actor's cue)

I cannot understand how the remainder of the clue works.

(Other definitions for cue that I've seen before include "Signal to players" , "Sports implement" , "Catchword" , "Hint for a snooker or billiards striker" , "Signal for player" .)

I've seen this clue in the Evening Standard.

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