Related Clues:

• Marbles, so to speak
• Suspect's out
• It may be lost
• Rationale
• Be responsible for
• An activist has one
• Something to believe in
• Child's question
• Equal rights, e.g.
• Motive
• It may be airtight
• Defense of a sort
• Grafton's A
• Let off the hook
• "I was at the movies," e.g.