Crossword Genius

Simple pond plant (4)

Ross

I believe the answer is:

alga

(Other definitions for alga that I've seen before include "Simple plant, plankton or seaweed say" , "nuisance on the beach?" , "Gala class of seaweed" , "Possibly tangle" , "Simple, non-flowering, aquatic plant" .)

I've seen this clue in The Wall Street Journal.
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