From Parliament ran centrist lobby (8)
I believe the answer is:
entrance
'lobby' is the definition.
(thesaurus)
'from parliament ran centrist' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ENTRANCE' is hidden within 'parliament ran centrist'.
(Other definitions for entrance that I've seen before include "Way in - hypnotise" , "Carry away" , "Charm - one's way in" , "transport" , "arrival" .)