Crossword Genius

Single-celled animal (6)

Ross

I believe the answer is:

amoeba

'single-celled animal' is the definition.
(I've seen this before)

This is the entire clue.

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

I've seen this clue in The Telegraph, The Wall Street Journal, The Times and The Sun.
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