Crossword Genius

Drifting microorganisms (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Diminutive drifter" , "food for school, possibly" , "Whale's staple diet" , "Drifting aquatic organisms" , "Simple marine life" .)

I've seen this clue in The Times.
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