Instrument played while seated (5)
I believe the answer is:
cello
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">instrument played while seated</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" , "It's bigger than a viola, but smaller than a double bass" , "Viola's bigger brother?" , "10 [INSTRUMENT]" , "Bass stringed instrument" .)