Crossword Genius

Most abundant noble gas in the atmosphere (5)

Ross

I believe the answer is:

argon

'most abundant noble gas in the atmosphere' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for argon that I've seen before include "An insert gas to groan about" , "Inert gas, symbol Ar" , "elementary" , "Inert gas, present in small amounts in the air" , "Gas used in electric lights" .)

I've seen this clue in the USA Today and the Wall Street Journal.
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