Crossword Genius

Kind of layer (5)

Ross

I believe the answer is:

ozone

'kind of layer' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ozone that I've seen before include "Allotropic gas" , "Bracing air (colloq.)" , "(Depleted) layer of gas" , "That precious layer" , "Gas that screens ultraviolet radiation" .)

I've seen this clue in The New York Times.
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