Related Clues:

• Primitive dwelling
• Den site
• Tiresome routine
• Wagon wheel groove
• It's hard to get out of
• Batman's hideout
• Stone Age abode
• Hibernation site
• Deep groove
• Monotonous practice
• Spelunker's setting
• Yogi Bear's home
• Tiresome grind
• Concavity
• Stalactites' locale