Possible Clues:

• Big cat may leap round and round in the road
• Fast cat
• See 6
• Initially easy work taken by fat cat
• Animal that doesn't change its spots
• Rising American writer feeding fat cat
• Energy and work needed to stab into fat animal
• Author making a come-back through 'Fat Cat'
• Spotted carnivor
• Mistakenly paroled, predator that's invariably spotted?