Orchestra (4)
I believe the answer is:
band
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orchestra</span>' is the definition.<br/ ><span class="explanation-format__explanation">(large musical group)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for band that I've seen before include "Musicians - gang" , "Strip, belt; playing group" , "Loop; rock group" , "Pop group, perhaps" , "troop" .)