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What braces a person supporting the Socceroos? (5)

Ross

I believe the answer is:

ozone

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'what braces a' is the definition.
I can't judge whether this definition defines the answer.

'person supporting the socceroos?' is the wordplay.
'person' becomes 'one' (I've seen this in other clues).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'the socceroos?' becomes 'oz' (I can't explain this - if you can you should give a lot more credence to this answer).
'one' put after 'oz' is 'OZONE'.

Can you help me to learn more?

(Other definitions for ozone that I've seen before include "Sea-air" , "Sea air; bleaching agent" , "Less common form of oxygen" , "Atmospheric layer in some danger" , "Protection" .)

I've seen this clue in The Telegraph.
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