Possible Clues:

• Fundamental principles
• Fundamental principle
• Solid ground
• Badger editor to go in for basic principles
• Doctor with duck in northern stream revealing what is fundamental
• "The Flintstones" city
• Fundamental principles exist, with ringleader on trial?
• Flintstones' hometown
• Solid foundation - make this and young child may rest at night?
• Where Fred Flintstone lives