Crossword Genius

*Persistent, as an ailment (5)

Ross

I believe the answer is:

conic

(Other definitions for conic that I've seen before include "Figure of circle, ellipse, parabola or hyperbola" , "Tapering from a circle to a point" , "solid, curved" , "With a tapering shape" , "Making point" .)

I've seen this clue in the Universal.
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