Festive song (5)
I believe the answer is:
carol
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">festive song</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for carol that I've seen before include "Girl" , "Christmas ditty" , "sing happily" , "Joyful song - girl's name" , "Canticle" .)