Group of musical notes (5)
I believe the answer is:
chord
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">group of musical notes</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chord that I've seen before include "'The Lost - - ' (Sullivan)" , "Combination of musicians" , "Combination of notes sounded in harmony" , "Combination of musical notes" , "line for mathematicians" .)