Gas produced by individual from Australia (5)
I believe the answer is:
ozone
'gas' is the definition.
(I know that ozone is a type of gas)
'individual from australia' is the wordplay.
I cannot quite understand how this works, but
'individual' could be 'one' (an individual is one person) and 'one' is found within the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
A single letter 'z' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'produced by' is the link.
Can you help me to learn more?
(Other definitions for ozone that I've seen before include "Stratospheric layer of gas -- invigorating sea air" , "That precious layer" , "Gas forming screen against ultraviolet radiation in the stratosphere" , "Condensed oxygen; sea air" , "Pungent form of oxygen" .)