Hip-related (7)
I believe the answer is:
sciatic
'hip-related' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sciatic that I've seen before include "Largest nerve in the body" , "Relating to a nerve of the lower back" , "(Of a nerve) in the region of the hip" , "Nerve connected with back pain" , "Relating to the hip or to pain around the body's longest nerve" .)