Part of an ear (3)
I believe the answer is:
cob
'part of an ear' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cob that I've seen before include "Swan of Jacobean origin" , "Source of bread" , "mount" , "mixture of clay and straw" , "Horse, male swan and loaf of bread" .)