Related Clues:

• Cryptoquote, really
• Morse's creation
• Umpire's call, sometimes
• Not in harm's way
• What a spy may write in
• Wall unit, perhaps
• Program lines
• Holder of securities
• Nonpoisonous, e.g.
• Java ingredient?
• Out of danger
• Something to crack
• Box for crackers?
• Sound companion?
• Set of rules