Singer-actor Montand (4)
I believe the answer is:
'singer-actor montand' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yves that I've seen before include "Frenchman, so-called?" , "Montand, Fr. actor" , "French man" , "-- Montand (French actor)" , "__ Saint Laurent, couturier, d. 2008" .)