Saul certainly suppresses corrupting influence (5)

I believe the answer is:

ulcer

'corrupting influence' is the definition.
(ulcer can mean a moral blemish)

'saul certainly suppresses' is the wordplay.
'suppresses' indicates a hidden word (the clue suppresses or covers up the answer).
'ULCER' is hidden within 'saul certainly'.

(Other definitions for ulcer that I've seen before include "Cruel sort of open sore" , "Sore point" , "Cruel kind of body sore" , "Spot of bother" , "Cruel (anag.)" .)

I've seen this clue in The Guardian.

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.