Crossword Genius

Its anger dissipated, it won't react (5,3)

Ross

I believe the answer is:

inert gas

I'm a little stuck... Click here to teach me more about this clue!

'it won't react' is the definition.
The definition suggests a singular noun which matches the answer.

'its anger dissipated' is the wordplay.
'dissipated' indicates anagramming the letters.
'its'+'anger'='itsanger'
'itsanger' anagrammed gives 'INERT GAS'.

Can you help me to learn more?

(Other definitions for inert gas that I've seen before include "Passive element in the helium group" , "Unreactive "noble" element, such as argon" , "Eg, helium or argon" , "Eg, helium, xenon etc." , "Such as neon or xenon" .)

I've seen this clue in The Telegraph.
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