Related Clues:

• Grafton's A
• "I was at the movies," e.g.
• Murder mystery feature
• Suspect's explanation
• One might stand up in court
• Suspect eliminator
• Whodunit item
• Explanation
• Crook's cover
• Exculpatory evidence
• Innocence indicator
• Contaminate
• It eliminates suspects
• It should be airtight
• Arrow application