Possible Clues:

• Most pricey tool for fencing going up between two streets
• Most expensive car gets away from pacesetters
• Most pricey
• Most precipitous
• Most expensive insurers ultimately bother to include support for drivers
• Ways in which sword is held up as extremely dear
• Detailed horse bug as most severe
• Very much inclined to become a nuisance under the tees
• Dentist finally going in to identify pain that's most sharp
• Most difficult to climb