Crossword Genius

Wherein swimmers are taught? (7)


I believe the answer is:


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'wherein swimmers are taught?' is the definition.
I can't judge whether this defines the answer.

'swimmers are taught?' is the wordplay.
'swimmers' becomes 'school' (group of fish).
'are taught?' becomes 's' (I can't explain this - if you can you should give a lot more credence to this answer).

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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