Possible Clues:

• Place to learn some manners
• Place to learn manners
• Sophisticated, so it's said, after spells here, perhaps?
• Where social graces may be mastered
• Educational institution for witches?
• Institution with Post graduates?
• Spoils children in relaxed training centre
• Is taking first in history in trendy female establishment
• Academy where young ladies are taught social graces
• In which young ladies learn to spell?