Saint in Kansas is very bad (6)
I believe the answer is:
'is very bad' is the definition.
I can't judge whether this definition defines the answer.
'saint in kansas' is the wordplay.
'saint' becomes 'st'.
'kansas' becomes 'ks'.
Can you help me to learn more?
(Other definitions for stinks that I've seen before include "Smells unpleasant", "Chemistry (school slang)", "Smells to high heaven".)