Crossword Genius

Overtake swimmer (4)

Ross

I believe the answer is:

goby

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

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

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.
Want a hint initially instead of a full solution? Install my app