Violin relative (5)
I believe the answer is:
cello
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">violin relative</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 cello that I've seen before include "Played by Rostropovich" , "music produced by this?" , "Tortelier's instrument" , "Jacqueline du Pre's instrument" , "Musical instrument like large violin held between knees" .)