A listener to something corny? (3)

I believe the answer is:

ear

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'a listener' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for ear that I've seen before include "willingness to listen" , "Lughole" , "Part of corn plant" , "Organ involved with balance" , "Sensory organ" .)

I've seen this clue in the Evening Standard.

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