Crossword Genius

Stratospheric gas (5)

Ross

I believe the answer is:

ozone

'stratospheric gas' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ozone that I've seen before include "Pungent form of oxygen" , "Invigorating air of the seaside" , "Stratospheric layer of gas -- invigorating sea air" , "Gas forming screen against ultraviolet radiation in the stratosphere" , "Condensed oxygen; sea air" .)

I've seen this clue in the Sydney Morning Herald, the Newsday and The Times.
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