Crossword Genius

Form of oxygen (5)

Ross

I believe the answer is:

ozone

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of oxygen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ozone that I've seen before include "Invigorating air of the seaside" , "Toxic form of oxygen" , "Gas formed from oxygen" , "Seaside air, maybe" , "That precious layer" .)

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