Possible Clues:

• Source of oats
• Horse�s feed container
• Container for a horse's dinner
• Horse takes outsize bits of early barley from this?
• Be old nag's supply? It might
• Muzzle attachment
• Horse feed supporter
• Is familiar with, say, land where Arab may eat
• Spy on immoral woman and feed supplier
• Live like this, backing into horse and its food supply