Feature of the "Welcome to Fabulous Las Vegas" sign (4)

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "None (anag.)" , "Gas used in fluorescent lamps" , "Small plant; colour" , "Could it brighten proceedings" , "Colourless, odourless rare gas" .)

I've seen this clue in the LA Times.

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