Duke that wife will leave for another duke (9)
I believe the answer is:
ellington
This could be a double definition.
'duke that wife will leave' is the first definition.
'ellington' can be an answer for 'duke' (I've seen this before). I'm unsure of the rest of the definition.
'another duke' is the second definition.
'ellington' can be an answer for 'duke' (I've seen this before). I am not sure about the 'another' bit.
'for' is the link.
Can you help me to learn more?
(Other definitions for ellington that I've seen before include "Duke (of jazz)" , "Duke --, twentieth century band leader" , "One Duke" , "Duke - (Mood Indigo)" , "Musician" .)