Crossword Genius

Like safety vests' colors (4)

Ross

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "Small plant; colour" , "Type of lighting" , "One of the six inert gasses" , "Colourless, odourless rare gas" , "Brightly coloured advertising sign" .)

I've seen this clue in the USA Today.
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