Possible Clues:

• One ____ of carbon is buckminsterfullerene
• One of multiple forms in which an element may exist
• Line added to grant form: one of several?
• Parcel out executioner's equipment: it comes in various forms
• Grant painter graphite, perhaps
• Distribute something known by expert in alternative form
• Distinct form of an element
• Diamond, for instance, in a Trollope novel
• Differing form for scientists showing grant — something binding?
• Give out binder for elementary version