Related Clues:

• Like most fast sudoku solvers
• At the head of one's class
• Sting a bit
• Snazzy
• Of high intelligence
• Shoe phone user
• Highly intelligent
• Eligible for 1-Across
• Feel stung
• Like some bombs or cookies
• Steve Carell role
• Agent 99's partner
• Mensa material
• TV's "Get _____"
• Like a member of Mensa