Gossip about a balloon (6)
I believe the answer is:
gasbag
I believe this is a double definition.
'gossip' is the first definition.
(I've seen this before)
'a balloon' is the second definition.
(thesaurus)
'about' is the link.
(Other definitions for gasbag that I've seen before include "Person who talks too much - or a balloon" , "Idle chatterer" , "Excessive chatterer" , "One who natters a lot" , "Talkative person or filled balloon" .)