Crossword Genius

Fresh bracing air (5)

Ross

I believe the answer is:

ozone

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

This is the entire clue.

(Other definitions for ozone that I've seen before include "Pungent form of oxygen" , "Form of atmospheric oxygen" , "Sea air (found in layer?)" , "Bracing seaside air" , "Gas; bracing sea air" .)

I've seen this clue in The Guardian.
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