Related Clues:

• Sharp, as vision
• Skeleton, for one
• One of a Florida island group
• ''Defense of Fort M'Henry'' author
• Answer book
• Finely honed
• C major or D minor
• Needed
• Very sharp
• Desperate, as a situation
• Type of statistics or signs
• Decoder's manual
• Much more than mere
• Not an option?
• Janitor's jangler