Possible Clues:

• Imaginary white horse with long horn
• You mythical crop of Ulster!
• Fabulous beast like one-horned horse
• It's one myth that you get Ulster grain like this
• Coat sported, unoriginally, by fabled beast
• Fabulous creature - one some might say I feed
• Legendary one-horned horse
• One has a point if it's going on ahead
• With one on the head and oneon the foot at last
• It's just a myth that there could be coir in a nun