In political life, it means everything (3)
I believe the answer is:
all
'everything' is the definition.
(all things)
'in political life it' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALL' can be found hidden inside 'political life it'.
'means' acts as a link.
(Other definitions for all that I've seen before include "nothing more" , "The works" , "Entirely; everyone" , "Every single one" , "The lot, everyone" .)