Possible Clues:

• Regularly appraised, admitting look's plain
• Restorative sort of oyster, it's plain
• Couple tours river that is in grassland
• Area of open grassland
• Some of the American heartland
• Plain couple that is welcoming affair, finally
• Couple crossing river that is in grassland
• Plain expression that is concluding publicity
• Plain repair one botched
• Midwest expanse