Crossword Genius

Enters the office uninvited? (6)


I believe the answer is:


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

'enters' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for usurps that I've seen before include "Seizes wrongfully or by force" , "Takes a position of power illegally" , "Takes position wrongfully or by force" , "Encroaches upon" , "takes place" .)

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