1920s dance (10)
I believe the answer is:
charleston
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">1920s dance</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 charleston that I've seen before include "Lively dance - then carols (anag)" , "Lively 1920s' dance" , "Dance making" , "Nineteen twenties dance" , "US city - 1920s' dance" .)