Screen bride’s attendant behind house (4,4)
I believe the answer is:
home page
'screen' is the definition.
(a home page is shown on a screen)
'bride's attendant behind house' is the wordplay.
'bride's attendant' becomes 'page' (as in a page boy).
'behind' says to put letters next to each other.
'house' becomes 'home' (homing is a kind of housing).
'page' put after 'home' is 'HOME PAGE'.
(Other definitions for home page that I've seen before include "website feature" , "introduction to site" , "First point of call on website" , "Introductory part to a website" , "Internet site intro" .)