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

I believe the answer is:

krill

(Other definitions for krill that I've seen before include "Small aquatic creatures" , "Crustaceans eaten by whales" , "What baleen whales eat" , "Whale food" , "Tiny crustaceans" .)

I've seen this clue in The Mirror.

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