Singer Charles (3)
I believe the answer is:
'singer charles' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ray that I've seen before include "Man who engaged in surrealist photography" , "Flatfish or sunbeam" , "Beam; man's name" , "Beam; flat-bodied fish" , "Shaft, beam" .)