Crossword Genius

Glass tube illuminant (4)

Ross

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "Colourless gas, used in lighting" , "None like bright city light" , "Colourless noble gas" , "Gas used in fluorescent lighting" , "Gaseous element, in advertising sign say" .)

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