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Vehicle run-in blamed for crashing one? (8,6)

Ross

I believe the answer is:

cardinal number

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

'one?' is the definition.
(I've seen this before)

'vehicle run-in blamed for crashing' is the wordplay.
I cannot quite see how this works, but
'vehicle' could be 'car' (car is a kind of vehicle) and 'car' is found within the answer.
'run' could be 'r' (cricket abbreviation) and 'r' is found within the answer.
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for cardinal number that I've seen before include "Maybe one" , "For instance, one" , "It could be one" , "one, perhaps" , "E.g. one" .)

I've seen this clue in The Sunday Times and The Times.
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