Shrimp-like crustaceans, a key link in the marine food chain (5)

I believe the answer is:

krill

(Other definitions for krill that I've seen before include "Tiny crustaceans" , "seafood" , "Tiny shrimps" , "What baleen whales eat" , "Whale food" .)

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

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