He won't eat anything (7)
I believe the answer is:
epicure
'he won't eat anything' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for epicure that I've seen before include "An individual of some discrimination" , "Lover of fine eating" , "A faddist in food and drink" , "Bon vivant" , "Person with fastidious tase in food and wine" .)