Writer at dance is a US idiot
I believe the answer is:
meatball
'a us idiot' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'writer at dance' is the wordplay.
'writer' becomes 'me' (the person who wrote the clues).
'dance' becomes 'ball' (ball is a kind of dance).
'me'+'at'+'ball'='MEATBALL'
'is' is the link.
Can you help me to learn more?
(Other definitions for meatball that I've seen before include "One found in Greek keftedes" , "A round of minced beef" , "Dull American" , "Something to savour" , "Globular food item" .)