Related Clues:

• Dirty political tactic
• Low life?
• Tiny creature
• Pseudopod possessor
• Microscopic organism
• Microscopic critter
• Tiny organism
• Attack ad, maybe
• Malign
• Shape-changing protozoan
• Besmirch
• Life on a slide
• One-celled blob
• It forms food vacuoles
• Slight on the stump, say