Possible Clues:

• Ugly building in a pretty area, say
• Looks at cavity again -- not a pretty sight
• Monstrosity setter picked out in speech
• Offensive looking stye
• Flower pushed up through hole in slag heap, say
• Eeyore's upset -- not a pretty sight
• Neighborhood embarrassment
• Stye -- or carbuncle?
• View spoiler
• Sight!