Spinal parts (5)
I believe the answer is:
discs
'spinal parts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for discs that I've seen before include "Layers of cartilage between vertebrae - they may slip" , "They're round and flat" , "Records" , "Flat, circular plates" , "Flat, thin circular objects" .)