Possible Clues:

• Insert (into the body)
• I intend to occupy mountain lodge
• Insert minute design in it
• Pacemaker, for instance, is at heart simple worker
• Confession of spy? Something put in one's mouth
• Insert within a body
• I'm going to the factory - and that means graft
• Fix motorway design inside it
• Artificial insert in body
• Author's idea and time put in