Adam's apple? (9,5)
I believe the answer is:
forbidden fruit
This might be a double definition.
'adam's' is the first definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?
'apple?' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for forbidden fruit that I've seen before include "Illicit pleasure" , "Apple" , "Restricted as to diet?" , "Something naughty not allowed" .)