Small jazz band or dance band (5)
I believe the answer is:
combo
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">small jazz band</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">dance band</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(combo is a kind of dance band)</span><br/ ><br/ ></span>
(Other definitions for combo that I've seen before include "Small jazz or dance band" , "Small jazz group" , "Small pop group" , "musicians" , "Small (jazz or rock) band" .)