Bring up seat (4)
I believe the answer is:
rear
I believe this is a triple definition!
'bring' is the first definition.
(thesaurus)
'up' is the second definition.
(thesaurus)
'seat' is the third definition.
(I know that seat can be written as rear)
(Other definitions for rear that I've seen before include "Breed or bring up" , "Jump" , "Stern" , "Posterior" , "Raise - back" .)