Related Clues:

• Challenge accepted by one radical rising up
• Type of devil?
• Challenge borders on the danse macabre
• Risk; challenge
• 'Bet you can't!' e.g
• Have the nerve to read novel
• A silly stunt may be done on one
• Have the effrontery to serve up bit of horseradish
• Be brave enough
• "Double-dog" challenge
• Say "Bet you can't!"
• "Solve the rest of this puzzle Downs-only," e.g
• Blatant challenge
• "Bet you can't!" is one
• Have the audacity