Type of jazz (5)
I believe the answer is:
bebop
'type of jazz' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bebop that I've seen before include "Jazz style of 40s" , "Type of jazz" , "1940s' form of modern jazz" , "Jazzy music style" , "Form of modern jazz from about 1940" .)