Crossword Genius

Shrimp-like marine crustacean; the principal food of whalebone whales (5)

Ross

I believe the answer is:

krill

(Other definitions for krill that I've seen before include "Small shrimp-like creatures eaten by whales" , "Food of whalebone whales" , "seafood" , "Small aquatic creatures" , "Very small crustaceans" .)

I've seen this clue in The Mirror.
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