Minstrel's instrument? (4)
I believe the answer is:
lute
'minstrel'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 "instrument that minstrel played" , "Old stringed instrument with a pear-shaped body" , "Subject to drugs" , "Plucked instrument; a sealant" , "Play instrument" .)