Crossword Genius

Toxic form of oxygen (5)

Ross

I believe the answer is:

ozone

'toxic form of oxygen' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ozone that I've seen before include "Trioxygen" , "something found in the atmosphere" , "Toxic form of oxygen" , "Fresh, bracing sea air" , "Gas forming protective layer" .)

I've seen this clue in The Times.
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