Crossword Genius

Laughing talk? (3)

Ross

I believe the answer is:

gas

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'talk?' is the definition.
(gas can mean to chat)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for gas that I've seen before include "Chatter vapidly" , "Carbon dioxide, say" , "rabbit" , "State of matter not solid or liquid" , "Fuel; idle talk" .)

I've seen this clue in the Evening Standard.
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