Neuralgia in the hip region (8)
I believe the answer is:
sciatica
'neuralgia in the hip region' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sciatica that I've seen before include "I cast CIA out for this painful disorder" , "Compression of nerve roots in back and thigh" , "Neuralgia of the hip and thigh" , "Pain around back or hip" , "Type of neuritis" .)