Upright build (5)
I believe the answer is:
erect
I believe this clue is a double definition.
'upright' is the first definition.
(I know that upright can be written as erect)
'build' is the second definition.
(I know this)
(Other definitions for erect that I've seen before include "Upright; put up" , "Construct, build" , "Assemble" , "Build, set up" , "Unbowed" .)