Crossword Genius

Signal failure to put line in this, perhaps? (3)

Ross

I believe the answer is:

cue

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cue that I've seen before include "Signal for player" , "Actor's signal" , "Hint on stage" , "Reminder to do something" , "Sports implement" .)

I've seen this clue in The Guardian.
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