Sergeant is mixing neon and argon (5,5)

I believe the answer is:

inert gases

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'neon and argon' is the definition.
I can't judge whether this defines the answer.

'sergeant is mixing' is the wordplay.
'mixing' indicates an anagram.
'sergeant'+'is'='sergeantis'
'sergeantis' is an anagram of 'INERT GASES'.

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I've seen this clue in the Sydney Morning Herald.

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