Private releases tension by grabbing female - that's damnable (8)
I believe the answer is:
infernal
'damnable' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for infernal that I've seen before include "Hell-like" , "Extremely annoying" , "Relating to the underworld" , "Devilish" , "awful" .)