Bard's instrument (4)
I believe the answer is:
lute
'bard's instrument' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lute that I've seen before include "Ancient stringed instrument" , "Elizabethan stringed instrument" , "Old stringed instrument with a pear-shaped body" , "Play instrument" , "Old plucked instrument" .)