"Valley Girl" singer-songwriter (5)
I believe the answer is:
zappa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">valley girl singer-songwriter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for zappa that I've seen before include "Frank --, US musician" , "American musician" , "Inventive musician" , "Mothers of Invention leader" , "Frank ---, US rock composer" .)