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Atmospheric gas (5)

Ross

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5

6 8

'atmospheric gas' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ozone that I've seen before include "Colourless gas, O3" , "Atmospheric layer in some danger" , "Sea-air" , "invigorating British air" , "Shield against radiation" .)

I've seen this clue in The Telegraph and The Sun.
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