Long-necked instrument (4)
I believe the answer is:
lute
'long-necked 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 "Elizabethan stringed instrument" , "Old stringed instrument with a pear-shaped body" , "Plucked, pear-shaped instrument" , "Stringed instrument shaped like a halved egg" , "Old plucked instrument" .)