Frenchman is corrupt or bent (6)
I believe the answer is:
breton
'frenchman' is the definition.
(I've seen this before)
'corrupt or bent' is the wordplay.
'corrupt' is an anagram indicator.
'or'+'bent'='orbent'
'orbent' is an anagram of 'BRETON'.
'is' acts as a link.
(Other definitions for breton that I've seen before include "Frenchman" , "Language of NW France" , "Surrealist" , "Inhabitant of northwest France" , "Cooked with cheese and/or breadcrumbs on top" .)