Crossword Genius

Krill, for example (8)

Ross

I believe the answer is:

plankton

(Other definitions for plankton that I've seen before include "Small organisms that float in water in great numbers" , "Whale's staple diet" , "Microscopic organisms that float on the surface of water" , "Microscopic organisms in seawater" , "Drifters in the sea" .)

I've seen this clue in The Times and The Sunday Times.
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