Ear part (4)
I believe the answer is:
lobe
'ear part' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lobe that I've seen before include "Part of ear or leaf" , "Rounded projection of a larger structure" , "Bottom part of ear" , "Appendage to ear" , "Division of the lungs or brain" .)