Possible Clues:

• Irish county
• The North is where the insect is on the Border
• Giant's Causeway county
• Got six feet over the border to the North
• The insect is over the Border in Ulster
• County in Ireland's north-east
• An address in the South may be all in the North
• Sounds as if one might sin with us north of the Border
• County boundary overlooked by hill worker
• Lives in a hill on the Border or just over it