Do jazzy vocals in musical with elevated finale (4)
I believe the answer is:
scat
'do jazzy vocals' is the definition.
(scatting is a type of singing in jazz)
I don't understand how the remainder of the clue works.
(Other definitions for scat that I've seen before include "improvisation in jazz" , "Buzz off" , "Shoo!" , "Jazz-singing" , "Go away quickly" .)