Possible Clues:

• Horse from European Union gasps, having had treatment
• Winged creature from Lewis
• Winged beast rejected drink containing herb
• In extremely pure air, American mount in the clouds
• Mount flying picket, American style
• It's Margaret, with a South American horse that's truly fantastic
• Stars, for example, appearing in father's country
• The Flying Horse's soft sausage rolls lacking original character
• After wee dram there's a suspicion you'll see stars
• Does Margaret like us flying?