Crossword Genius

Talk that may have leaked out (3)

Ross

I believe the answer is:

gas

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for gas that I've seen before include "rabbit" , "Oxygen is one" , "Petrol (USA)" , "may fill American car" , "Petrol (US)" .)

I've seen this clue in the Evening Standard.
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