Nice meal pet ruined that’s near fireplace (11)
I believe the answer is:
mantelpiece
'that's near fireplace' is the definition.
'nice meal pet ruined' is the wordplay.
'ruined' indicates an anagram.
'nice'+'meal'+'pet'='nicemealpet'
'nicemealpet' with letters rearranged gives 'MANTELPIECE'.
(Other definitions for mantelpiece that I've seen before include "place by fire?" , "Shelf over fireplace" , "Fireplace surround" , "Structure around a fireplace" .)