Dame ___ Melba, operatic soprano (6)
I believe the answer is:
nellie
(Other definitions for nellie that I've seen before include "'There's an old mill by the stream, . . . . . . Dean'" , "Dame -- Melba, singer" , "Girl" , "'There's an old mill by the stream,......Dean'" , "Old song: ''Wait Till the Sun Shines . . . . . .''" .)