Related Clues:

• Caps lock, for one
• Manual opener
• Padlock partner
• It'll get you in
• Little island
• Shift, for one
• Lock partner
• ''The Defense of Fort McHenry'' author
• Musical signature
• Vitally important
• Put a scratch in, as a car's paint job
• Bit of land in a river
• Organ piece
• Safe box opener
• Thing on a ring