Possible Clues:

• Cabinet needs to prove argument ...
• Exhibit porky figure around hotel with odd character
• Son using which method to lead trial presentation?
• 'The Price Is Right' highlight
• In Oxford, say, was holding college's first exhibition
• Something bid on on 'The Price Is Right'
• Display toilet while in Oxford, perhaps?
• Exhibit cow as she moves
• Museum display unit
• 'The Price Is Right' prize