Crossword Genius

Coast with small migrating fish (8)

Ross

I believe the answer is:

seahorse

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

'fish' is the definition.
(seahorse is a kind of fish)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for seahorse that I've seen before include "Fish" , "swimmer" , "marine creature" , "that's found in the main" .)

I've seen this clue in The Times.
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