Old pear-shaped instrument (4)
I believe the answer is:
lute
'old pear-shaped 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 "Old plucked instrument" , "Protective packing" , "instrument that minstrel played" , "Stringed instrument shaped like a halved egg" , "Old musical instrument" .)