Bluegrass instrument (5)
I believe the answer is:
banjo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bluegrass instrument</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for banjo that I've seen before include "Five-stringed musical instrument" , "Stringed instrument of the guitar family" , "Stringed instrument with long neck" , "Stringed instrument beloved of old minstrel shows" , "Formby's instrument" .)