Earring site (4)
I believe the answer is:
lobe
'earring site' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lobe that I've seen before include "Rounded projection of a larger structure" , "Leaf division" , "Bottom part of ear" , "could be site of a 24 [STUD]" , "Roundish projecting part" .)