Protozoan (6)

I believe the answer is:

amoeba

'protozoan' is the definition.
(I know that amoeba is a type of rhizopod)

This is the entire clue.

(Other definitions for amoeba that I've seen before include "Unicellular creature" , "Basic life form" , "Unicellular form" , "cell for life" , "Protozoon" .)

I've seen this clue in the Penny Press.

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