Servings of corn (4)
I believe the answer is:
ears
'servings of corn' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ears that I've seen before include "Listening organs" , "Sense organs" , "Organs for 7 down" , "''He who has ... to hear, let him hear'' (bible)" , "Corn; organs" .)