Crossword Genius

Small marine creatures (5)

Ross

I believe the answer is:

krill

(Other definitions for krill that I've seen before include "Crustaceans eaten by whales" , "seafood" , "Very small crustaceans" , "Whales' staple diet" , "Crustaceans, diet of whales" .)

I've seen this clue in The Telegraph.
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