Form of neuralgia (8)
I believe the answer is:
sciatica
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of neuralgia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sciatica that I've seen before include "I cast CIA out for this painful disorder" , "Pain from pressure on a nerve in the hip area" , "Neuralgia of the hip and thigh" , "Pain around back or hip" , "Lower back and hip pain" .)