Possible Clues:

• Scrap round hairdo - it's boring
• Piercing tool
• British drama school will then throw out one learner that's boring
• Commercial interrupts fight -- it's a boring item
• Boring article from American lawyer getting into violent argument
• Prosecutor enters noisy quarrel that's boring
• In fight notice something piercing?
• Cousin of a screwdriver
• One makes a little piercing cry about political reformist
• Pitt's the greatest, we hear, boring tool!