Troubadour's instrument (4)
I believe the answer is:
lute
'troubadour's instrument' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lute that I've seen before include "clay" , "Old musical instrument" , "Ancient stringed instrument" , "Stringed instrument shaped like a halved egg" , "Play instrument" .)