Related Clues:

• It may be cracked
• Spy's secret
• Principles
• Pig Latin, e.g.
• It's heard just before a click
• Lips service?
• Spy's writing, perhaps
• Secret message
• One if by land, two if by sea, etc.
• Kind of word
• Value system
• Cheese accompaniment?
• Photographer's request
• Genetic or dress follower
• Put on a happy face