Items of decor, nice set, and ample for redecoration (12)
I believe the answer is:
Here is my best explanation:
'items of decor' is the definition.
'nice set and ample for redecoration' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'for redecoration' is an anagram indicator.
'niceset' put after 'ample' is 'ampleniceset'.
'ampleniceset' with letters rearranged gives 'MANTELPIECES'.