Related Clues:

• Like the walls behind Cub outfielders
• Like some green walls
• Vine-covered
• Like the walls at Harvard
• Greenery-covered, as walls
• Greenery-covered, in a way
• Overgrown by a climbing evergreen
• Like many college walls
• Vine-covered, as a wall
• Overgrown, like college walls
• Covered with vines
• I struggled, overcome by climber
• Like some academic walls
• Covered with greenery, as some walls
• Like the Chicago Cubs' outfield