Shelved piece of furniture that now needs replacing (7)
I believe the answer is:
whatnot
'shelved piece of furniture' is the definition.
(type of shelving unit)
'that now needs replacing' is the wordplay.
'needs replacing' is an anagram indicator (I've seen 'needing replaced' mean this (the letters must be placed elsewhere)).
'that'+'now'='thatnow'
'thatnow' with letters rearranged gives 'WHATNOT'.
(Other definitions for whatnot that I've seen before include "Stand with shelves - knick-knack" , "Stand with shelves for small items" , "Thing whose name is temporarily forgotten" , "Set of shelves" , "Shelved stand for ornaments" .)