Possible Clues:

• High-IQ
• Bright; sting
• It's not stupid to feel hurt
• TV's "Get _____"
• Clever; sting
• Trim - sting
• TV's Agent 86
• Like most fast sudoku solvers
• Word that can precede the last word of 17-, 24-, 48- and 58-Across
• What In Flames are, besides "Strong"