Olympian splashing about swim-lane at intervals (5,4)

I believe the answer is:

usain bolt

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'olympian' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'splashing about swim-lane at intervals' is the wordplay.
'splashing' indicates an anagram (I've seen 'splashing of' mean this (I've seen this in other clues)).
'at intervals' means one should take alternating letters (letters are taken at regular intervals).
'swim'+'lane'='swimlane'
The alternating letters of 'swimlane' are 'siln'.
'about'+'siln'='aboutsiln'
'aboutsiln' is an anagram of 'USAIN BOLT'.

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

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