Shelving unit that now wobbles (7)
I believe the answer is:
whatnot
'shelving unit' is the definition.
I can't judge whether this definition defines the answer.
'that now wobbles' is the wordplay.
'wobbles' indicates an anagram (I've seen 'wobbling' mean this).
'that'+'now'='thatnow'
'thatnow' with letters rearranged gives 'WHATNOT'.
Can you help me to learn more?
(Other definitions for whatnot that I've seen before include "part of the furniture" , "Thingummy - display stand" , "This piece of furniture" , "A stand with shelves for small objects" , "Portable stand with shelves" .)