Orchestral piece (8)
I believe the answer is:
concerto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orchestral piece</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 concerto that I've seen before include "Musical composition" , "Orchestral piece" , "Composition for accompanied soloist" , "Work for soloist and orchestra" , "Composition for orchestra and soloist" .)