Yo-Yo strings? (5)
I believe the answer is:
cello
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yo-yo strings?</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 "Large stringed instrument" , "Played by Rostropovich" , "10 [INSTRUMENT]" , "large-scale fiddle" , "Tortelier's instrument" .)