Crossword Genius

Highlighter tone (4)

Ross

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "Brightly coloured advertising sign" , "Type of lighting" , "Gas used in fluorescent lighting" , "Colourless, odourless rare gas" , "Element 10, used in lights" .)

I've seen this clue in the LA Times.
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