Possible Clues:

• Intellectual missing social worker finds girl in tropical grassland
• Plain vehicle goes from South America to North America
• For the most part, avoid girl, plain
• Hoard clipped Indian coin, that's plain!
• A vehicle principally noted in South Africa’s grasslands
• Habitat for giraffes
• In South America, a vehicle principally needed in treeless plain
• Displaying this makes a van nationalistic, it's plain
• Plain southern woman digesting version of Bible
• Newly differentiated 12 on the 3