Related Clues:

• Endocrine gland
• It works to have a nest egg
• Chick's mother
• Mother ptarmigan, e.g.
• Layer?
• Clutch producer?
• See 97-Across
• Farm clucker
• Egg layer
• Natural incubator
• Pullet, e.g.
• Mother __
• Female reproductive gland
• She lays eggs
• Cooped-up one