Possible Clues:

• 'Break free, get away (6)'
• See about the headgear and get away from it
• Prisoner's plot
• Flee from snakes initially invading European headland
• E's got something on his head and can get away with it
• Prison breakout
• Leave that asshole zookeeper behind forever, provided you can find a way into the sewer
• "Stalag 17" event
• Beach book genre
• See about the headgear. One may get away with it