Related Clues:

• Egg source
• Coop dweller
• Coop denizen
• Setter
• Brooding mother
• 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.