Independent politician finishes off the established procedure to get in the way (6)
I believe the answer is:
impede
'get in the way' is the definition.
(I've seen this in another clue)
'independent politician finishes off the established procedure' is the wordplay.
'independent' becomes 'i'.
'politician' becomes 'MP' (Member of Parliament).
'finishes off' says to take the final letters (take the finishing letters off of the words).
The final letters of 'the established procedure' are 'ede'.
'i'+'mp'+'ede'='IMPEDE'
'to' acts as a link.
(Other definitions for impede that I've seen before include "Obstruct, hold up progress" , "Hinder or delay" , "Stand in the way of progress" , "Hinder, form an obstacle to" , "Interfere with progress" .)