Possible Clues:

• The sort of ground that top farmers cultivate?
• Everlasting cool celebrity on the box?
• The sort of ground for which farmers opt for change
• Ground too hard for farmers to turn over after first ploughing
• Layer of soil that never thaws
• Farmers opt mistakenly for unsuitable agricultural terrain
• Two big hairstyles on street feature up North
• One hairstyle after another -- on the street that's exceptionally cool
• In Russian city, American poet describing a polar feature
• Arctic soil phenomenon