Related Clues:

• Pecan or walnut
• Bat's beginning
• Part of a copse
• Colony
• Digs in twigs
• Part of a rookery
• Mimosa, for one
• Genealogical chart
• See 9-Across
• Build a tree house?
• Tree house
• Place of refuge
• Type of surgeon
• Arborist's concern
• Home in a hemlock