In the end, brings together seat majority (8)
I believe the answer is:
rearmost
'in the end' is the definition.
'brings together seat majority' is the wordplay.
'brings together' is a charade indicator (letters next to each other).
'seat' becomes 'rear' ('rear' can be a synonym of 'seat'**).
'majority' becomes 'most' (I've seen this before).
'rear'+'most' is 'REARMOST'.
(Other definitions for rearmost that I've seen before include "Fully behind" , "Furthest back" , "farthest from the front" , "More rats (anag)" , "last" .)