Asiatic winds over Cape producing pain (8)
I believe the answer is:
sciatica
'pain' is the definition.
(sciatica is a kind of pain)
'asiatic winds over cape' is the wordplay.
'winds' indicates an anagram.
'over' means one lot of letters goes inside another.
'cape' becomes 'c' (abbreviation used on maps).
'asiatic' is an anagram of 'sciatia'.
'sciatia' going around 'c' is 'SCIATICA'.
'producing' is the link.
(Other definitions for sciatica that I've seen before include "Neuralgia of the hip and thigh" , "Pain around back or hip" , "Form of neuralgia" , "Pain in the back, hip and leg" , "I cast CIA out for this painful disorder" .)