Related Clues:

• Addition to the staff?
• Pivotal
• Something passed in music class?
• D or F
• One of 88
• F, G, but not H
• Importance
• Hotelier's handout
• 53-Down is one
• Cryptographer's aid
• Do, e.g.
• It's passed in class
• He wrote "Defense of Fort M'Henry"
• Speck in the ocean
• Athletic award