Anaesthetic injected into the spinal cord (8)
I believe the answer is:
epidural
'anaesthetic injected into the spinal cord' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for epidural that I've seen before include "Injection of anaesthetic into the spinal cord" , "Anaesthetic used in childbirth" , "Painkiller" , "Anaesthetic injected into the spinal cord" .)