Bring up behind tower (4)
I believe the answer is:
rear
I believe this is a quadruple definition!!
'bring' is the first definition.
(thesaurus)
'up' is the second definition.
(thesaurus)
'behind' is the third definition.
(both can mean one's bottom)
'tower' is the fourth definition.
(I know this)
(Other definitions for rear that I've seen before include "Raise; behind" , "Breed or bring up" , "Rise up at the back" , "early, long before now" , "Bring up - the tail" .)