Counterintuitively best fare from Bavaria — zilch for you in the end (5)
I believe the answer is:
worst
'end' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for worst that I've seen before include "Least competent" , "Make mincemeat of" , "Least satisfactory" , "Lowest of the low" , "Strangely, best" .)