Possible Clues:

• Mouldable wall plaster
• Plaster for moulding
• Plaster work
• Mixture for decorative use on buildings
• Exterior wall treatment
• Southern firm engages workers to make wall coating
• Plaster for bad cuts the firm makes
• Carves up the firm outside the building
• Got the stick - O, just on the outside
• About to make savings, business produces cement