Possible Clues:

• Character introduced in The Little White Bird
• Saint subject to criticism? That's child's play
• JM Barrie character
• Eternally young boy’s potential energy initially worried parent
• Barrie's hero
• Play safe with hammer
• Play safe with cooking utensil
• Crude apprentice, no longer in charge: He'll never grow up!
• JM Barrie hero
• Eternal youth to dwindle and be exhausted (but not out in either case)