Possible Clues:

• Material for a drawer in a school - the type anyone doing a rough sketch could draw on?
• Sketcher's purchase
• Material to sketch on
• Topless character taking exam? If one has to draw a line it may as well be on this!
• A part played by the Cartoonists' Foundation?
• Stationer's supply
• Sketching material
• Creative resource that may be drawn upon