Related Clues:

• Secret
• Storage area
• Storage space
• Private
• Particular
• Skeleton's place?
• Requirement
• On ___ (without commitment)
• Keep locked up
• Blueprint item
• On ___ (like much freelance work)
• On ___ (without assurance of payment)
• Hide-and-seek hideout
• Small detail?
• On ___ (without a contract)