Crossword Genius

Wrong way to achieve a takeover (5)

Ross

I believe the answer is:

usurp

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'wrong' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for usurp that I've seen before include "Expropriate" , "Seize wrongfully" , "Seize unlawfully" , "Take control of without authority" , "Take over - misappropriate" .)

I've seen this clue in The Globe and Mail.
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