Related Clues:

• ''I was at home sleeping at the time,'' e.g.
• It might be airtight
• Defendant's defense
• Likely story?
• Criminal excuse
• Defendant's dodge
• Whodunit discovery
• Exculpatory story
• Feature of many a whodunit
• Cover story
• Literally, 'elsewhere'
• Suspect's out
• Scull-and-crossbones stuff
• It may be airtight
• Defense of a sort