Greek mandolin (8)
I believe the answer is:
bouzouki
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek mandolin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bouzouki that I've seen before include "Greek stringed instrument" , "Despond" , "Greek mandolin-like instrument" , "Source of music" , "Greek lute" .)