The Clue Six-foot runner?
The Answer ANT
The answer "ANT" fits the clue "Six-foot runner" because ants are small insects that can be found running on the ground. The term "six-foot" can be a playful way to refer to something that is actually much smaller, like an ant. Additionally, ants are known for their speed and ability to carry objects many times their size. So, even though they are tiny, they are often seen running around quickly.