Orchestra leader (9)
I believe the answer is:
conductor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orchestra leader</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for conductor that I've seen before include "Director of an orchestra" , "Copper is a good one" , "Bandleader" , "Director - band leader" , "who may wave his hands about?" .)