Crossword Genius

Gas, Cl (8)

Ross

I believe the answer is:

chlorine

I believe this is a double definition.

'gas' is the first definition.
(I know that chlorine is a type of gas)

'cl' is the second definition.
(synonyms)

(Other definitions for chlorine that I've seen before include "Pale green gas" , "It's used to purify water" , "Yellowish-green gas" , "Chemical used as poison gas and water supply disinfectant" , "It's used to purify a swimming pool" .)

I've seen this clue in The Guardian.
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