Independent politician two journalists obstructed (7)
I believe the answer is:
impeded
'obstructed' is the definition.
('impede' can be a synonym of 'obstruct')
'independent politician two journalists' is the wordplay.
'two journalists' means two substitutions for 'journalist'.
'independent' becomes 'i'.
'politician' becomes 'mp' (Member of Parliament).
'journalist' becomes 'ed' (short for editor).
'journalist' becomes 'ed' (short for editor).
'i'+'mp'+'ed'+'ed'='IMPEDED'
(Other definitions for impeded that I've seen before include "Held up" , "Blocked, hindered" , "Hindered, slowed down" , "Hampered" , "Blocked (progress)" .)