Possible Clues:

• Like dolls within dolls
• Like stacked measuring bowls
• Fit snugly inside
• Settled requirement intercepted by saint
• Prepared for a new arrival, say
• Fitting one inside another
• Built a home (birds)
• Built a home for good man in want
• Have to have made a home around the little street
• Including fly-half, study backs in intricate arrangement