Crossword Genius

Overtake swimmer (4)

Ross

I believe the answer is:

goby

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'swimmer' is the definition.
(goby is a kind of aquatic vertebrate)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for goby that I've seen before include "Small fish" , "swimmer in the sea" .)

I've seen this clue in The Independent.
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