Marching around building (4)
I believe the answer is:
arch
'building' is the definition.
'marching around' is the wordplay.
'around' indicates the answer is hidden within the clue.
'ARCH' is hidden in the letters of 'marching'.
(Other definitions for arch that I've seen before include "in short, is out of date" , "architectural feature" , "Affectedly playful in curved manner" , "Curved form" , "Cunning; span" .)