Violin part (4)
I believe the answer is:
neck
'violin part' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for neck that I've seen before include "Isthmus; impudence (sl.)" , "Canoodle; isthmus" , "Adam's apple location" , "Body part and the nerve to do something" , "Kiss amorously" .)