Microscopic single-celled organism (6)

I believe the answer is:

amoeba

(Other definitions for amoeba that I've seen before include "parasitic type" , "little creature" , "Protozoan of ever-changing shape" , "Microscopic creature found in water" , "Constantly-changing one-celled creatures" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.