Possible Clues:

• Pen for the sound of a hymn tune
• Pen the doubler in the coal
• Horse enclosure out West
• Famous gunfight at the OK ..... in American West
• Place to break a bronco
• Get one's head together?
• Pen what are, in short, in a product of the sea
• Wailiet?
• Pen in
• Pen for cattle - ring of waggons