Crossword Genius

Fuels exciting things (5)

Ross

I believe the answer is:

gases

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

'things' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe there's a link between them I don't understand?

'fuels exciting' is the wordplay.
'fuels' becomes 'gas' (gas is a kind of fuel).
'exciting' becomes 'es' (I can't justify this - if you can you should give a lot more credence to this answer).
'gas'+'es'='GASES'

Can you help me to learn more?

(Other definitions for gases that I've seen before include "Vapours" , "Air-like fluids" , "Cruelly kills" , "Compressible fluids" , "Hydrogen and carbon monoxide, say" .)

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