The merry widow in "The Merry Widow" (5)
I believe the answer is:
sonia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the merry widow in the merry widow</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 sonia that I've seen before include "...O'Sullivan, great Irish athlete" , "Noa is really a girl" .)