Possible Clues:

• Portable platform
• Slip when you take to the slopes - head first? No, last!
• Lose control on the highway
• With 2-Down, vagrants' district
• It leaves marks on asphalt
• Richard's not caught up in potential cause of accident
• Driving mishap
• Uncontrolled car movement
• Leave tyre marks
• One so young might slip under the South