Crossword Genius

Rebuking for putting the brakes on (7,2)

Ross

I believe the answer is:

pulling up

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

'rebuking' is the definition.
Although both the answer and definition are present participle verbs, I cannot understand how they can define each other.

I don't understand how the rest of the clue works.

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