Unwanted topping of vitamin! Uncle's spitting out large coffee (6,3)
I believe the answer is:
dunces cap
'coffee' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dunces cap that I've seen before include "Ignorant boy's headgear" , "Classroom idiot's headgear" , "Headgear used to humiliate slow learners" .)