Opera heroine, often (7)
I believe the answer is:
soprano
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">opera heroine often</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 soprano that I've seen before include "(Singer of) the highest vocal range" , "gangster" , "Female singer" , "High female voice" , "Norman, perhaps" .)