Related Clues:

• Catbird seat?
• College course division
• Building block
• Subdivision
• Kind of surgeon
• Motel room
• Genealogical work
• The 'U' of CPU
• Ebony or mahogany
• Troop group
• Hand or foot
• Course, in education lingo
• Part of I.C.U.
• Birch
• Platoon or squadron, e.g.