Related Clues:

• The region inside
• Hidden, covert
• Region inside
• Hidden, private
• Covert, private
• The area inside
• Inside of a building
• Inner part
• Inside opening?
• Confidential or mysterious
• Kept hidden from others
• 'Hidden, covert (6)'
• Not seen or know by others
• There's about a hundred trees there, but don't tell anyone
• Never hide here