Crossword Genius

Organisms in birdbaths (5)

Ross

I believe the answer is:

algae

(Other definitions for algae that I've seen before include "Seaweeds etc" , "Type of seaweed" , "'Simple plants, such as seaweed (5)'" , "Seaweeds generally" , "Plants like seaweed" .)

I've seen this clue in the Universal.
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