Possible Clues:

• I'm your friend with one buck
• I married mate, a horny type
• Monkey in style of deer
• If I am your friend to start with, a little more and it's worth one buck
• Classic Chevy offering
• Chevy classic
• Antelope with slender, curved horns
• The writer's friend, a native of South Africa
• Mischief-maker in the manner of a horned beast
• Spectacular jumper sported in Blenheim Palace