Stratosphere layer that shields Earth from solar radiation (5,5)

I believe the answer is:

ozone layer

(Other definitions for ozone layer that I've seen before include "Shield against radiation" , "Region in stratosphere" , "Part of upper atmosphere giving protection from ultraviolet rays" , "One thinning over Antarctic" , "protection from sun" .)

I've seen this clue in The Sunday Times and The Times.

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