Crossword Genius

Australia has singular, bracing air (5)

Ross

I believe the answer is:

ozone

'bracing air' is the definition.
(I've seen this before)

'australia has singular' is the wordplay.
'australia' becomes 'oz'.
'has' is a charade indicator (letters next to each other).
'singular' becomes 'one' ('one' can be a synonym of 'singular').
'oz'+'one'='OZONE'

(Other definitions for ozone that I've seen before include "(Depleted) layer of gas" , "Allotrope of oxygen" , "Layer that protects against ultraviolet rays" , "Toxic form of oxygen" , "Sea air; bleaching agent" .)

I've seen this clue in The Telegraph.
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