Crossword Genius

Is such an enemy cursed? (5)

Ross

I believe the answer is:

sworn

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'cursed?' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

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

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(Other definitions for sworn that I've seen before include "confirmed in office" , "Given under oath" , "Stated on oath" , "promised" , "Affirmed" .)

I've seen this clue in the Evening Standard.
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