Build upright (5)
I believe the answer is:
erect
This clue is a double definition.
'build' is the first definition.
(I know that erect is a kind of build)
'upright' is the second definition.
(I know that upright can be written as erect)
(Other definitions for erect that I've seen before include "Rigidly upright" , "Standing vertically" , "Unbowed" , "Upright or vertical" , "Upright; construct" .)