French singer Edith
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">french singer edith</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 piaf that I've seen before include "French singer, the Little Sparrow, d. 1963" , "French singer who regretted nothing" , "Edith, the "Little Sparrow"" , "Edith -, Fr. cabaret singer (Non, je ne regrette rien)" , "Edith -, twentieth century French cabaret singer" .)