Short simple song (5)
I believe the answer is:
ditty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">short simple song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ditty that I've seen before include "Air" , "Light-hearted song" , "Simple tune" , "Little tune" , "Short simple song" .)