Study with conclusion ignored contains flaw, leading to disease (7)
I believe the answer is:
cholera
'disease' is the definition.
(cholera is a kind of health problem)
'study with conclusion ignored contains flaw' is the wordplay.
I cannot really understand how this works, but
'flaw' could be 'hole' (as in a hole in one's logic) and 'hole' is found in the answer.
This explanation may well be incorrect...
'leading to' is the link.
Can you help me to learn more?
(Other definitions for cholera that I've seen before include "Infectious and often fatal Asiatic disease" , "Oh, Clare has highly infectious disease" , "Infectious disease causing severe bowel upset" , "Intestinal infection caused by contaminated water or food" , "Acute infection caused by contaminated water or food" .)