Jazzman Kenton (4)
I believe the answer is:
stan
'jazzman kenton' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stan that I've seen before include "Eminem hit; man's name" , "Ollie's partner" , "- Getz, jazz musician" , "- Laurel, Hardy's partner" , "Laurel perhaps" .)