Highly-skilled musician (8)
I believe the answer is:
virtuoso
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highly-skilled musician</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 virtuoso that I've seen before include "One has exceptional musical skill" , "Maven" , "Great player" , "Highly-skilled musician" , "Great musical performer" .)