Swimmer raced naked to go under time (6)

Ross

I believe the answer is:

turtle

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

'swimmer' is the definition.
(I know that turtle is a type of swimmer)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for turtle that I've seen before include "Shelled reptile" , "Large marine reptile (with a fashionable neck!)" , "Shelled marine creature" , "Mock or Teenage Ninja?" , "Birds typifying love" .)

I've seen this clue in The Guardian.

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