"I Won't Dance" composer
I believe the answer is:
kern
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">i won't dance composer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for kern that I've seen before include "Jerome __ , Show Boat composer, d. 1945" , "Old soldier" , "See 14 Across" , "See 12" , "Popular composer" .)