Crossword Genius

Gas, one from Australia? (5)

Ross

I believe the answer is:

ozone

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

'gas' is the definition.
(I know that ozone is a type of gas)

'one from australia?' is the wordplay.
'one from' becomes 'o' (I've seen this in other clues).
'australia?' becomes 'zone' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'zone'='OZONE'

Can you help me to learn more?

(Other definitions for ozone that I've seen before include "A gas; threatened layer in air" , "Sea air (found in layer?)" , "invigorating British air" , "Form of oxygen in earth's upper atmosphere - there's a hole in it" , "Gas formed from oxygen" .)

I've seen this clue in The Times.
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