Jaunty musical rhythm (4)
I believe the answer is:
lilt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jaunty musical rhythm</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lilt that I've seen before include "Tune with light pleasant rhythm" , "Swing - music" , "Jaunty musical rhythm" , "Light, bouncy rhythm" , "...jaunty rhythm, perhaps" .)