Related Clues:

• Flirtatious gesture
• Spy's writing, perhaps
• Secret sign
• Secret message
• One if by land, two if by sea, etc.
• Kind of word
• Value system
• Genetic or dress follower
• Epitome of quickness
• [Just kidding!]
• Preparation that needs a cracker?
• Set of principles
• Word with bar or area
• Flirt's signal
• The 'C' in U.P.C.