Possible Clues:

• Barrier shared by adjoining properties
• Semi attacher?
• Keeping the neighbours apart could be divisive for the Government members
• Keeping the neighbours apart could be divisive between Fine Gael and Labour?
• Divider common to two rooms or buildings
• Dividing line sees creative quarter obscured by cloud
• With everyone on the right, political group creates division in the House
• Social event, with everything that may be shared between neighbours
• Might such entertainment , perhaps, double you and all?