Come up to this way to cancel race entry (7)

I believe the answer is:

scratch

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

'come up' is the definition.
(I know that come up can be written as scratch)

I can't explain the rest of the clue.

(Other definitions for scratch that I've seen before include "Score - postpone indefinitely" , "Superficial wound" , "Fine, up to this" , "Withdraw - abrasion" , "Mark with something sharp" .)

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

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