Related Clues:

• Principle on which a theory is founded
• Ability to think rationally
• 'Motivation, grounds (6)'
• Motive for an action
• Area of enclosed land around a building
• Underlying support for a theory
• That proves you're not all there
• It's not for prosecution that one may remove the barrier like this, perhaps
• Why, that's about a child!
• Is this why one might think about a start for 33 across?
• Having no feet they can only totter, it seems
• The way to claim that one was not all there
• It's questionable if this had a turn for a bird
• Is this why it's about one of the next generation?
• Do this to me and pardon it