It may glow in the dark (4)

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "'Chemical element, often used in lights (4)'" , "One of the six inert gasses" , "One of the six inert gases" , "Atomic number 10" , "Gas used in fluorescent lamps" .)

I've seen this clue in The New York Times.

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