Dessert, note, containing that oddly bitter tang? (10)
I believe the answer is:
aftertaste
This could be a double definition.
'dessert note containing that oddly bitter' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'tang?' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for aftertaste that I've seen before include "What lingers in the mouth" , "Lingering impression" , "Lingering sensation in mouth" , "Relish experienced" , "as the table is cleared?" .)