Opera about an opera singer (5)
I believe the answer is:
tosca
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">opera about an opera singer</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 tosca that I've seen before include "Coats off for Pucccni's opera" , "title role" , "Opera - a Scot (anag)" , "musical work" , "Luigi -, Italian playwright" .)