Possible Clues:

• Biodegradable pipe material
• Middle of ear has painful growth, firm and black
• Bit of maize revealed by my new horse
• Cookout waste
• Would amaze one, by the sound of it , what's there
• Horse after its food - it's attached to grain
• Part of the ear - it can be smoked
• Woody core of maize
• Potential pipe
• Kind of pipe