Possible Clues:

• Court spot for giving testimony
• Courtroom fixture
• Where to buy testimony?
• Observe in Croke Park or in court in America that involves a brief encounter
• Spot on street as well as facing the bench in New York for Brief Encounter
• Spectator in the stadium? Presumably there's some truth in it for those holding court!
• Feature of US courts
• Is this where all the evidence is to be found under the judge's nose perhaps?
• 21-Across are taken on it
• Courtroom enclosure