Operatic piece (4)
I believe the answer is:
aria
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">operatic piece</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 aria that I've seen before include "Operatic tune" , "Operatic solo, duet, etc" , "Operatic solo performance" , "Air in an opera" , "Repeated strain" .)