Possible Clues:

• Core with kernels
• Middle ear?
• There's corn on - and maybe in - it
• Corn on or in this
• Discarded part of a 13-Down
• May have corn on or in it
• This horse bled on the rough road
• It has corn all over it
• How corny for the horse to have bled when the going got tough
• There's a horse in the corn