Related Clues:

• "You are ___ to me"
• Like most fast sudoku solvers
• At the head of one's class
• Sting a bit
• Kind of duck or letter
• Snazzy
• Conked out for good
• Doornail's state
• In need of recharging
• Of high intelligence
• Exhausted, as a battery
• Shoe phone user
• See 32 Across
• Highly intelligent
• Unpopulated