Large stringed instrument (5)
I believe the answer is:
cello
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large stringed instrument</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 cello that I've seen before include "Large stringed instrument" , "big fiddle?" , "Musical instrument like large violin held between legs" , "It's bigger than a viola, but smaller than a double bass" , "large-scale fiddle" .)