Possible Clues:

• Where social graces are taught
• Refinery, as it were, in ... in trying to catch ... a lot of fish
• Where social graces are taught, and what 17-, 23-, 38-, and 55-Across each has
• Where one might learn etiquette ... or a hint to the answers to starred clues
• Where young ladies end up?
• Its members are instructed to come out
• Private college breaking up?
• Polish pupils educated here?
• Does this mean the end of the class struggle?
• The end of class? Hardly!