Hammered instrument (8)
I believe the answer is:
dulcimer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hammered instrument</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 dulcimer that I've seen before include "Mild cure for musical instrument" , "Stringed instrument played with hammers" , "Hammered instrument" , "Old percussion instrument" , "Instrument of Xanadu damsel (Coleridge)" .)