Crossword Genius

Salmon school off-limits at sea (4)

Ross

I believe the answer is:

coho

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'salmon' is the definition.
(type of salmon)

I don't understand how the rest of the clue works.

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(Other definitions for coho that I've seen before include "Small north Pacific salmon" , "Fish" .)

I've seen this clue in the Sydney Morning Herald.
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