Prepare supply and change decor (7)
I believe the answer is:
repaper
'change decor' is the definition.
(as in putting up new wallpaper)
'prepare supply' is the wordplay.
'supply' is an anagram indicator (in a supple way).
'prepare' is an anagram of 'REPAPER'.
'and' acts as a link.
(Other definitions for repaper that I've seen before include "Decorate again (palindrome)" , "Apply new wall covering" , "Cover walls again" , "renew wall-covering" , "Decorate walls again" .)