Crossword Genius

Hydrogen gas shock (4)

Ross

I believe the answer is:

hair

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

'hydrogen gas' is the wordplay.
'hydrogen' becomes 'h' ('H' can be a synonym of 'hydrogen').
'gas' becomes 'air'.
'h'+'air'='HAIR'

(Other definitions for hair that I've seen before include "Mane" , "Musical with nude scenes" , "Whisker" , "The American Tribal Love-Rock Musical (1967)" , "Outgrowth from the skin" .)

I've seen this clue in The Guardian.
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