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Without head start, doubt snail beats this runner (5,4)

Ross

I believe the answer is:

usain bolt

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

'without head start doubt snail beats this' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'runner' is the wordplay.
I cannot quite understand how this works, but
'runner' could be 'bolt' (runner Usain Bolt) and 'bolt' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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