Crossword Genius

Warning of red room missed by companion (5)

Ross

I believe the answer is:

amber

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'warning' is the definition.
(amber traffic light)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for amber that I've seen before include "Stone" , "Cautionary colour" , "Name of female" , ""Stop" traffic light" , "first light" .)

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