Operatic highlight (4)
I believe the answer is:
aria
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">operatic highlight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aria that I've seen before include "Air in an opera" , "Opera solo" , "Nessun Dorma, for example" , "selection of opera" , "Piece of music" .)