Crossword Genius

Stop signal (3,5)

Ross

I believe the answer is:

red light

'stop signal' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for red light that I've seen before include "Warning signal" , "Indication of immoral area" , "Don't go through it!" , "Stop signal" , "Signal not to go on!" .)

I've seen this clue in The Guardian and the Sydney Morning Herald.
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