Related Clues:

• The 'U' in B.T.U.
• Army detachment
• Dram or gram
• CPU part?
• Apartment, to a manager
• Blood-bank measure
• Air conditioner, e.g.
• Dennis Haysbert series (with ''The'')
• Blood measure
• Inch, foot or yard
• Squad, e.g.
• Part of a group
• Foot, say
• The 'U' in 21-Down
• Btu part