Comic Wagner piece (3)
I believe the answer is:
wag
This could be a double definition.
'comic' is the first definition.
(wag can mean a comical person)
'wagner piece' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
Can you help me to learn more?
(Other definitions for wag that I've seen before include "Move briskly from side to side like tail" , "Move briskly to and fro" , "Move briskly like dog's tail" , "The wit to move the tail" , "Accompanying lovely" .)