"Valley Girl" singer-songwriter (5)
I believe the answer is:
zappa
'valley girl singer-songwriter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(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" .)