Musicians' gathering (7)
I believe the answer is:
session
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">musicians' gathering</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for session that I've seen before include "Time of court's sitting" , "Period of business for official body" , "Period devoted to an activity" , "Studio recording period" , "Meeting of a court or parliament" .)