Insensitivity to pain (9)
I believe the answer is:
analgesia
'insensitivity to pain' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for analgesia that I've seen before include "No hard feelings" , "Inability to feel pain" , "painless" , "result of medication?" , "Absence of pain" .)