It's easy to concoct lies about a politician (6)
I believe the answer is:
simple
'it's easy' is the definition.
(associated in meaning)
'concoct lies about a politician' is the wordplay.
'concoct' indicates an anagram (I've seen 'concocted' mean this).
'about' indicates putting letters inside.
'a politician' becomes 'MP' (Member of Parliament).
'lies' with letters rearranged gives 'sile'.
'sile' going around 'mp' is 'SIMPLE'.
'to' acts as a link.
(Other definitions for simple that I've seen before include "Penniless pie seeker" , "Not complex, easy to do" , "Easily done" , "Mean" , "The opposite of difficult or elaborate" .)