Comrade’s rewritten middle of lecture for US politician (8)
I believe the answer is:
democrat
'us politician' is the definition.
(I've seen this before)
'comrade's rewritten middle of lecture' is the wordplay.
'rewritten' indicates an anagram.
'middle of' indicates the central letters.
The centre of 'lecture' is 't'.
'comrade' with letters rearranged gives 'democra'.
'democra'+'t'='DEMOCRAT'
'for' acts as a link.
(Other definitions for democrat that I've seen before include "Person who believes in government by and for the people" , "Believer in popular government" , "Member of one of US parties" , "Political type" , "American politician" .)