State of matter (3)

I think it could be either:

Which length description are you looking for?:

gas

'state of matter' is the definition.
(gas is a kind of state of matter)

This is the entire clue.

(Other definitions for gas that I've seen before include "Form of fossil fuel" , "Talk profusely" , "Neon, for example" , "State of matter not solid or liquid" , "eg CO2" .)

I've seen this clue in The Mirror, the LA Times and The Times.

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