Dear French singer (4)
I believe the answer is:
cher
This clue is a double definition.
'dear french' is the first definition.
(French term of affection)
'singer' is the second definition.
(I've seen this in other clues)
(Other definitions for cher that I've seen before include "US pop singer" , "Moonstruck star" , "Sonny and - -" , "US singer/actress - French river/department" , "US singer; dear (Fr.)" .)