Longing to forget partners' source of pain (7)
I believe the answer is:
otalgia
'pain' is the definition.
(otalgia is a kind of pain)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for otalgia that I've seen before include "Ear ache" , "Earache" , "pain!" , "Problem with ears" , "painful condition" .)