Singer McGraw (3)
I believe the answer is:
tim
'singer mcgraw' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tim that I've seen before include "Sir -- Rice, lyricist" , "Tiny -, Dickens character (A_Christmas Carol)" , "Tiny . . . is a loveable boy in fiction" , "- Rice, musical lyricist" , "Adjoin" .)