Extreme aversion (6)

I believe the answer is:

phobia

(Other definitions for phobia that I've seen before include "An irrational fear or dislike" , "Irrational fear of something" , "Overpowering fear" , "Irrational hatred" , "A lasting abnormal fear or dislike" .)

I've seen this clue in The Guardian and The Wall Street Journal.

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.