Flying ace doubly hot, in biting pain (9)
I believe the answer is:
toothache
This might be a double definition.
'flying ace doubly hot in' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'biting pain' is the second definition.
(pain felt when biting)
Can you help me to learn more?
(Other definitions for toothache that I've seen before include "Cause of sore mouth" , "Trouble with choppers" , "It causes grief" , "Odontalgia" , "Dental problem" .)