Background of PC that's prepared for hanging? (9)
I believe the answer is:
wallpaper
I believe this clue is a double definition.
'background of pc' is the first definition.
(as in a desktop wallpaper)
'that's prepared for hanging?' is the second definition.
(wallpaper can be hung on a wall)
(Other definitions for wallpaper that I've seen before include "Screen background" , "Mural decoration" , "Bland and unoriginal stuff - for decorating" , "Pasted covering" .)