Related Clues:

• Quick on the uptake
• Well-dressed
• Like Mensa members
• Sharp pain
• Like a 52-Across
• Tony
• High-IQ
• Quick to learn
• Sophisticated
• Feel the pain
• Classic TV's Maxwell
• Man in C.O.N.T.R.O.L.
• TV's Agent 86
• Mensa-suitable
• Be the victim of a sting?