Great musician and bon vivant (7)
I believe the answer is:
epicure
'bon vivant' is the definition.
('epicure' can be a synonym of 'bon vivant')
'great musician' is the wordplay.
'great' becomes 'epic'.
'musician' becomes 'ure' (Midge Ure).
'epic'+'ure'='EPICURE'
'and' acts as a link.
(Other definitions for epicure that I've seen before include "An individual of some discrimination" , "Gourmet" , "Fine food expert" , "anything but a John the Baptist type?" , "Lover of fine foods" .)