Crossword Genius

Layer in the atmosphere (5)

Ross

I believe the answer is:

ozone

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">layer in the atmosphere</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ozone that I've seen before include "Sea air (found in layer?)" , "Gas; bracing sea air" , "Kind of oxygen layer in atmosphere, has hole in it" , "Colourless gas, O3" , "Toxic form of oxygen" .)

I've seen this clue in The Telegraph and the Universal.
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