Crossword Genius

In which young whales show their class? (7)

Ross

I believe the answer is:

schools

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If this is the answer, I'm afraid I cannot explain it.

Can you help me to learn more?

(Other definitions for schools that I've seen before include "Colleges" , "Coaches, trains" , "Places of instruction" , "dolphins in groups, for example" , "Educates" .)

I've seen this clue in The Irish Independent.
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