Possible Clues:

• Cast a spell on a reportedly dead figure
• Half-a-dozen for one fig, in short
• 'Six aside, figuratively (7)'
• Its internal angles total 720 degrees
• Pencil cross section
• Jinx a reportedly spent figure
• Honeycomb cell shape
• ...which helped Kekulé conceive of the carbon atoms in 24 Across in the shape of a ___
• Cross-section of a pencil
• Shape of a soccer ball?