Talk of the town? (7)
'talk' is the definition.
(gas can mean to chat)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for gas that I've seen before include "Hydrogen possibly" , "Hydrogen, for example" , "Oxygen is one" , "Something that is neither solid not liquid" , "Nitrogen maybe" .)
(Other definitions for dialect that I've seen before include "Local language variant" , "Local form of language" , "Manner of speaking" , "Local way of speaking" , "Material damage" .)