Mouth or stomach sore (5)

I believe the answer is:

ulcer

(Other definitions for ulcer that I've seen before include "Cruel kind of body sore" , "Cruel form of stomach trouble?" , "Continuing source of pain" , "Inflamed lesion" , "Sore point" .)

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.