Related Clues:

• Course division
• The 'U' of B.T.U.
• Maxwell Smart, for one
• Cohesive entity
• Hospital division
• Watch covertly
• Single item
• Porcupine, for one
• Snoop (on)
• ''One Adam Twelve,'' e.g.
• Chinchilla or beaver, e.g.
• Microfilmer, maybe
• Military assignment
• Natural nibbler
• Rental space