Related Clues:

• Fundamental
• Florida island
• 1812 versifier
• Vital
• Coral reef
• Major
• Pivotal
• One of 88
• F, G, but not H
• Hotelier's handout
• 53-Down is one
• Cryptographer's aid
• He wrote "Defense of Fort M'Henry"
• Speck in the ocean
• Indispensable