Taking one's time reversing difficult racing conditions (5,4)

I believe the answer is:

going slow

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

'time reversing difficult racing conditions' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'taking one's' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'taking' could be 'on' (eg one taking drugs is 'on' drugs) and 'on' is present in the leftover letters.
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 Guardian.

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