Popular song (3)
I believe the answer is:
hit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">popular song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a hit song)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hit that I've seen before include "Successful song" , "A theatrical success" , "Theatrical success,quite striking" , "Thump" , "Best-selling record" .)