University record upsetting and difficult to stomach perhaps (5)
I believe the answer is:
ulcer
'university' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ulcer that I've seen before include "Cruel kind of bodily sore" , "Sore spot" , "cause of suffering" , "Stomach complaint" , "Cruel sort of body sore" .)