State of torment for one needing to reverse hair dye (7)

I believe the answer is:

gehenna

(Other definitions for gehenna that I've seen before include "underworld" , "Judaism's Hell" , "hellish situation" , "place of sacrifice" , "place of punishment" .)

I've seen this clue in The Times.

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.