Naive young girl suffering ennui, e.g. (7)
I believe the answer is:
ingenue
'naive young girl' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'suffering ennui e g' is the wordplay.
'suffering' indicates an anagram.
'ennui'+'e'+'g'='ennuieg'
'ennuieg' anagrammed gives 'INGENUE'.
Can you help me to learn more?
(Other definitions for ingenue that I've seen before include "Unsophisticated young female" , "Naive young woman" , "Naive young actress" , "She's artless" , "Artless innocent young girl on stage" .)