Possible Clues:

• Presenter and what her voice may come from
• Guest orator
• Chair of Parliament
• Orator; sound source
• Lecturer parks jeep without bumpers badly
• Ask peer about Bercow?
• One calls to order audio equipment
• Presiding officer of the House of Commons
• One in pulpit, say, making point in first half of sermon
• Central figure in Parliament, one declares