Planktonic crustaceans (5)

I believe the answer is:

krill

(Other definitions for krill that I've seen before include "Crustaceans, diet of whales" , "seafood" , "Food of whalebone whales" , "What baleen whales eat" , "Whale food" .)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.