Those listening to the corny bits? (4)
I believe the answer is:
ears
'those listening' is the definition.
(organs which listen)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for ears that I've seen before include "Sense organs" , "'''Friends, Romans, countrymen, lend me your ...'' (Julius Caesar) (4)'" , "Lugholes" , "Heads of corn" , "Lugs (colloq.)" .)