Dancer given part in Carmen, yet no fun looking back (7)
I believe the answer is:
fonteyn
'dancer' is the definition.
(I know that Fonteyn is a dancer)
'part in carmen yet no fun looking back' is the wordplay.
'part in' says the answer is hidden in the clue.
'looking back' is a reversal indicator.
'nyetnof' is hidden in the letters of 'carmen yet no fun'.
'nyetnof' written backwards gives 'FONTEYN'.
'given' acts as a link.
(Other definitions for fonteyn that I've seen before include "Danseuse" , "'Margot ..., prima ballerina (7)'" , "Margot ..., iconic English ballerina" , "Dame Margot --, ballet dancer" , "Margot ..., English prima ballerina" .)