Corrupt French nobleman in Canterbury, perhaps (6)
I believe the answer is:
seduce
'corrupt' is the definition.
(seduce can mean to corrupt or tempt)
'french nobleman in canterbury perhaps' is the wordplay.
'french nobleman' becomes 'duc' ('duke' in French).
'in' indicates putting letters inside.
'canterbury perhaps' becomes 'see' (see can mean an area associated with a bishop).
'duc' going inside 'see' is 'SEDUCE'.
(Other definitions for seduce that I've seen before include "Perhaps do this to pull" , "Lure or entice away from proper behaviour" , "get into bed?" , "Charm - deprave" , "Beguile" .)