Crossword Genius

Saint steps in to heal plague (5)

Ross

I think it could be either:

curve

curse
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But I've got no explanation for this one! Could you help me understand?

(Other definitions for curve that I've seen before include "Line that's not straight" , "Shape of 23 down" , "way of learning" , "Bending line" , "Not the straightforward" .)

I've seen this clue in The Independent.
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