Viola relative (5)
I believe the answer is:
cello
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">viola relative</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cello that I've seen before include "Tortelier's instrument" , "Music-maker" , "big fiddle?" , "Bass stringed instrument" , "It's bigger than a viola, but smaller than a double bass" .)