Crossword Genius

Single-celled organism (6)

Ross

I believe the answer is:

amoeba

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">single-celled organism</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for amoeba that I've seen before include "Microscopic organism consisting of a single cell changing constantly" , "Simplest animal form" , "Tiny organism consisting of single changing cell" , "O, Mam, be a one-celled animal" , "Microscopic animal found in water" .)

I've seen this clue in The Independent, The Times, the Sydney Morning Herald, The New York Times, the Universal, the USA Today and The Guardian.
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