Prolific talker about balloon (6)
I believe the answer is:
gasbag
This might be a double definition.
'prolific talker' is the first definition.
'gasbag' can be an answer for 'talker' (I have seen 'Compulsive talker' mean 'gasbag' so perhaps 'talker' could also mean 'gasbag'). I'm unsure of the 'prolific' bit.
'balloon' is the second definition.
(thesaurus)
'about' acts as a link.
Can you help me to learn more?
(Other definitions for gasbag that I've seen before include "Prattler" , "Chatterbox" , "A compulsive talker with balloon?" , "Talkative person or filled balloon" , "One talking excessively" .)