Ballad or carol
I believe the answer is:
song
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">ballad</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">carol</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for song that I've seen before include "Vocal composition" , "Musical composition with words" , "Ditty" , "Carol, for example" , "Musical rendition" .)