Crossword Genius

Train a group of dolphins, for example (6)

Ross

I believe the answer is:

school

I'm a little stuck... Click here to teach me more about this clue!

'train' is the definition.
(both can mean to teach or coach)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for school that I've seen before include "See 24" , "Train - group of porpoises" , "eg Harrow" , "Educate; group" , "Institute of education" .)

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