Crossword Genius

Tiny aquatic organisms (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Diminutive drifter" , "Water micro-organisms" , "Food source for aquatic creatures" , "food for school, possibly" , "Drifting aquatic organisms" .)

I've seen this clue in The Times.
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