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Course taken by some whales? (8)


I believe the answer is:


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'course taken by some whales?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

This is the entire clue.

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(Other definitions for plankton that I've seen before include "Small organisms that float in water in great numbers" , "Microscopic organisms that float on the surface of water" , "food for school, possibly" , "Microscopic sea food" , "Whale's staple diet" .)

I've seen this clue in The Globe and Mail.
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