Blobby, single-celled organism (6)

I believe the answer is:

amoeba

(Other definitions for amoeba that I've seen before include "little creature" , "Microscopic organism of single cell that changes shape constantly" , "One-celled animal found in water" , "Protozoan of ever-changing shape" , "Tiny organism consisting of single changing cell" .)

I've seen this clue in the USA Today.

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