Crossword Genius

Element in water (8)

Ross

I believe the answer is:

hydrogen

'element in water' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for hydrogen that I've seen before include "The commonest element" , "Combines chemically with oxygen to form water" , "Lightest gas" , "... ditto: symbol H" , "bomb-maker" .)

I've seen this clue in the Sydney Morning Herald.
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