Crossword Genius

Swimmer more sexy for Cockneys (5)

Ross

I believe the answer is:

otter

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'swimmer' is the definition.
(animal which swims)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for otter that I've seen before include "Something furry" , "Mammal, 'Tarka'" , "Water-loving animal" , "Playful aquatic animal of 'Tarka' fame" , "Lithe swimmer" .)

I've seen this clue in The Sun.
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