In technical jargon, a gaseous element (5)

I believe the answer is:

argon

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'gaseous element' is the definition.
(I've seen this in another clue)

'in technical jargon a' is the wordplay.
'ARGON' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for argon that I've seen before include "Gas, inert constituent of air" , "Noble gas used in light bulbs" , "Inert gas in atmosphere" , "something inert and insubstantial" , "Inert gas, present in small amounts in the air" .)

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