Related Clues:

• Trace - dog
• Partial darkness
• Dark shape (on the Opposition front bench?)
• Image cast - dog
• Darkness caused by obstruction
• Image caused by obscuring of light
• Follow closely - dark image - opposition
• Area of darkness caused by obstructing light
• Follow - dark patch
• Follow closely — taper (off)
• Dark image (of opposition?)
• Dark area — referring to parliamentary opposition
• Quarter side
• Pursue quietly
• Like the opposition, present without notice