Melodic Melba (6)
I believe the answer is:
nellie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">melodic melba</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nellie that I've seen before include "Old song: ''Wait Till the Sun Shines . . . . . .''" , "Elephant in a song" , "Girl" , "Dame -- Melba, singer" , "'There's an old mill by the stream, . . . . . . Dean'" .)