Crossword Genius

Gas in purple "neon" signs (5)

Ross

I believe the answer is:

argon

(Other definitions for argon that I've seen before include "Chemical element" , "Inert gas, symbol Ar" , "noble element" , "17 [GAS]" , "Inert gas, present in small amounts in the air" .)

I've seen this clue in the USA Today.
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