Possible Clues:

• Stuart A. played with Yes, the rock group?
• Busts those in middle of O'Connell Street for one celebrating old heroes
• Stands up in street for what celebrates old heroes
• Works of art, say, laid out to engage you in the Louvre?
• Sculptor's works
• Sculpture has to remain over sailor's about turn
• Pieces of sculpture mostly standing on a pair of parallel lines
• Place for marbles