Jazz band (4)
I believe the answer is:
trio
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jazz band</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for trio that I've seen before include "Group of Magi?" , "Band of three" , "(Composition for) three performers" , "Piece for three players" , "Beethoven's 'Archduke': famous piece written for this ensemble" .)