What braces a person supporting the Socceroos? (5)
I believe the answer is:
ozone
'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" .)