Count ____ of jazz (5)
I believe the answer is:
basie
'count of jazz' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for basie that I've seen before include "jazz great" , "Count ___ , US jazz pianist, d. 1984" , "Bandleader Count" , "Band leader" , "Jazz musician" .)