*Losing case, solicitor turned corrupt (6)
I believe the answer is:
rotten
'corrupt' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for rotten that I've seen before include "Something is ... in the state of Denmark (Hamlet)" , "Informally, very much" , "Decayed or detestable" , "Decayed or corrupt (60" , "'Gone bad, decayed (6)'" .)