It isn’t a newspaperman that’s corrupt (7)
I believe the answer is:
tainted
'corrupt' is the definition.
('tainted' can be a synonym of 'corrupt')
'it isn't a newspaperman' is the wordplay.
'it isn't' becomes 'taint' (I've seen this before).
'a newspaperman' becomes 'ed'.
'taint'+'ed'='TAINTED'
'that's' is the link.
(Other definitions for tainted that I've seen before include "Adulterated" , "corrupt" , "Flawed, contaminated" , "Spoiled, stained" , "I attend to spoiled condition" .)