Vocal work (7)
I believe the answer is:
cantata
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vocal work</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cantata that I've seen before include "Musical composition with religious text" , "One of 200+ by Bach" , "(a musical work)" , "Choral work" , "Work for voice(s) and orchestra" .)