Crossword Genius

Aquatic organism such as a diatom or kelp (4)

Ross

I believe the answer is:

alga

(Other definitions for alga that I've seen before include "Simple plant, plankton or seaweed say" , "Gala (anag.)" , "Plants such as seaweed" , "Simple, non-flowering, aquatic plant" , "Water plant for a gal" .)

I've seen this clue in The Times.
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