Crossword Genius

Single-cell organism (6)

Ross

I believe the answer is:

amoeba

'single-cell organism' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for amoeba that I've seen before include "Single-celled form of life of ever-changing shape" , "Freshwater or marine protozoa" , "One-celled animal found in water" , "Single-celled animal" , "little creature" .)

I've seen this clue in The Mirror and the Evening Standard.
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