"Moonstruck” star (4)
I believe the answer is:
cher
'moonstruck star' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cher that I've seen before include "1987 Best Actress Oscar winner for "Moonstruck"" , "Singer; dear (French)" , "US singer; dear (Fr.)" , "US singer/actress - French river/department" , "US pop singer" .)