Related Clues:

• It may be hard to keep
• Spy's find
• Ban alternative
• Kind of agent or ballot
• Skeleton in the closet, e.g.
• It may be hard to keep a juicy one
• Confidential item
• Confidence
• Clandestine
• Skeleton, so to speak
• Not generally known
• Something confidential
• Kept things
• Unknown to many
• Confidential