There's a lot to be said for being this (9)
I believe the answer is:
garrulous
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for garrulous that I've seen before include "Over-talkative" , "Loquacious and voluble" , "Chatty" , "Excessively talkative" , "Verbose" .)