Ken telling duo about jazz star (4,9)
I believe the answer is:
duke ellington
'jazz star' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'ken telling duo about' is the wordplay.
'about' indicates an anagram.
'ken'+'telling'+'duo'='kentellingduo'
'kentellingduo' with letters rearranged gives 'DUKE ELLINGTON'.
Can you help me to learn more?
(Other definitions for duke ellington that I've seen before include "Mood Indigo composer, d. 1974" , "Jazzman" , "US jazz bandleader" , "US band leader" , "Key player" .)