Possible Clues:

• Back at university, London one, after writer's urge to act
• Strong urge to act
• Instinctual urge
• Miles up (anag)
• Gut reaction I get checked regularly by doctor?
• Itch
• Drive up motorway, heading north to place of learning
• Reason for some buys
• Bring the boy along so that he can have some fun at your expense