Persistent denier (8)

I believe the answer is:

naysayer

(Other definitions for naysayer that I've seen before include "Yes, Aryan may be person who habitually denies or refuses" , "He refuses to agree" , "One who denies" , "Obstructionist" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.