Possible Clues:

• Place for trial run involving you no longer
• *Place to argue a case (In this clue's answer, note the first 4 letters + the last 2)
• Place to bring a suit
• You, long ago, housed in road that leads to government building
• Town square building
• Sports ground similar to 17 down where you'd expect to see action
• Has a session in 1 down, for instance, in the bar rooms perhaps
• See, audience judges work here?
• Its procedure may imprison you?
• Where a judge hears a case