Early jazz (4)
I believe the answer is:
jive
'early jazz' 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 "Lively dance" , "Jerky, jazz dance of the 1950s" , "Deceptive talk" , "Jazzy dance" , "Jerky dance of the 1940s and 1950s" .)