Politician runs article featured in defamation (7)
I believe the answer is:
liberal
'politician' is the definition.
(I've seen this before)
'runs article featured in defamation' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'article' becomes 'a' (the indefinite article in English).
'featured in' means one lot of letters goes inside another.
'defamation' becomes 'libel' (libel is a kind of defamation).
'r'+'a'='ra'
'ra' going within 'libel' is 'LIBERAL'.
(Other definitions for liberal that I've seen before include "Bountiful" , "Respectful of opinions different from one's own" , "(Of quantities) generous" , "Lavish" , "Broad-minded in Braille" .)