Possible Clues:

• Die-shaped compartment Lebanese extremists rejected
• Like Rubik's puzzling sort of equation
• As volumetric measures
• Like volume measure
• Solid young scout in charge
• Solid like a chubby child after removing her
• A little beastly way, I see, to make one all square
• Small seal on one front cover of volume
• Having depth
• Equation involving third powers