Lining up, we hear, for prompting on stage (6)

I believe the answer is:

cueing

'prompting on stage' is the definition.

I don't understand the rest of the clue.

(Other definitions for cueing that I've seen before include "Bringing in (an actor)" , "Signalling actor to speak" , "Prompting, actor perhaps" .)

I've seen this clue in The Times.

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