Success where corruption reduced by politician (7)
I believe the answer is:
victory
'success' is the definition.
(I know that success can be written as Victory)
'corruption reduced by politician' is the wordplay.
'corruption' becomes 'vice' (moral corruption).
'reduced' means to remove the last letter.
'by politician' becomes 'tory' (term for a Conservative Party politician. I am not sure about the 'by' bit.).
'vice' with its last letter removed is 'vic'.
'vic'+'tory'='VICTORY'
'where' acts as a link.
Can you help me to learn more?
(Other definitions for victory that I've seen before include "Success against an opponent" , "ship" , "Win" , "Successful ending to a struggle or contest" , "Opposite of defeat" .)