Possible Clues:

• Upward-growing conical formation in a cave
• Old German prisoners' home might say it's found in a cave
• Pillar of the underground in prison having served time
• 1-Across sight
• At war camp, little child that grows up
• *“The Great Escape” setting
• Pinnacle of precipitated calcite on the floor of a cave
• A good child on endless trail that's seen in cave
• Way a jailbird with power reportedly raised deposit
• One growing up in a cave?