Crossword Genius

Aquatic organism (4)

Ross

I believe the answer is:

alga

'aquatic organism' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for alga that I've seen before include "Primitive non-flowering, mainly aquatic, plant" , "Water plant with no stem or leaves" , "Gala (anag.)" , "Gala class of seaweed" , "Autotrophic organism" .)

I've seen this clue in The Independent.
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