Crossword Genius

Drifters in lakes or rivers (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Minute fish food" , "Microscopic organisms that float on the surface of water" , "Whale food" , "Microscopic sea food" , "Drifters in the sea" .)

I've seen this clue in the Sydney Morning Herald.
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