Crossword Genius

Colourless gas formed by an electric discharge in water (5)

Ross

I believe the answer is:

ozone

(Other definitions for ozone that I've seen before include "Pungent form of oxygen" , "Form of atmospheric oxygen" , "It's said to brace" , "Condensed oxygen; sea air" , "Less common form of oxygen" .)

I've seen this clue in The Mirror.
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