Shade, new, installed in a part of building (6)
I believe the answer is:
awning
'shade' is the definition.
(thesaurus)
'new installed in a part of building' is the wordplay.
'new' becomes 'n'.
'installed in' indicates putting letters inside.
'part of building' becomes 'wing' ('wing' is part of 'building'**).
'a'+'wing'='awing'
'n' going inside 'awing' is 'AWNING'.
(Other definitions for awning that I've seen before include "Protective cover" , "Canvas covering over, say, a patio" , "Shelter over a window" , "Canvas cover over a shop entrance" , "Sunshade" .)