Large group of musicians (9)
I believe the answer is:
orchestra
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large group of musicians</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 orchestra that I've seen before include "Eg, LSO, RPO" , "eg Halle" , "players in pit" , "A number of musicians" , "alternative to the organ" .)