Swagger as a bracing member (5)
I believe the answer is:
strut
This clue is a triple definition!
'swagger' is the first definition.
(both can mean to walk around arrogantly)
'as' acts as a link.
'a bracing' is the second definition.
(strut is a kind of bracing)
'member' is the third definition.
(I have seen 'Supportive member' mean 'strut' so perhaps 'member' could also mean 'strut')
(Other definitions for strut that I've seen before include "Support - pompous walk" , "Supporting rod" , "Trust (anag.)" , "that provides support" , "Stalk" .)