Crossword Genius

A 'stop' sign often interpreted as 'go' (5)

Ross

I believe the answer is:

amber

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'go' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

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(Other definitions for amber that I've seen before include "Yellow fossil-resin" , "Traffic-light colour" , "Prepare-to-stop signal" , "Colour of warning" , "Fossil resin used in jewellery" .)

I've seen this clue in the Evening Standard.
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