Possible Clues:

• Row of columns
• Feature of ancient Greek architecture
• It surrounds the Parthenon
• Row of trees in area in London somehow protected by church
• Porch-roof support
• Columns needing punctuation and English edited
• Pillars of the establishment?
• How the Dane comes after the punctuation in columns
• Doone clan involved supporters in a row
• Not pillars of society but very upright