Related Clues:

• Rat's home
• It's often out on a limb
• Egg setting
• Bird's dwelling
• Peeping spot
• Cozy abode
• Home of straw, maybe
• Branch home
• Fledgling's place
• Aerie, e.g.
• Swift production?
• Fledgling's home
• See 20-Down
• Stack, in a way
• Robin's place