Possible Clues:

• Burrower's mound, ruining the lawn
• Small uprising put down by spy
• Mound of earth in garden
• Result of minor excavation - strange hole's appearance in factory
• Certain mound of earth
• Mountain may be made out of it
• Small mound of earth
• Tiny mountain on the lawn?
• Agent goes to hospital unwell - exaggerators make much of it
• Spooner's entire factory gets small rise