Jazzy talk (4)
I believe the answer is:
jive
'jazzy talk' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jive that I've seen before include "Fast American dance" , "1930s' big band jazz style" , "Deceptive talk" , "Style of fast dance music" , "Fast dancing style" .)