Medieval instrument (4)
I believe the answer is:
lute
'medieval 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 "Plucked, pear-shaped instrument" , "clay" , "Elizabethan stringed instrument" , "Stringed instrument shaped like a halved egg" , "Subject to drugs" .)