Non-kosher Whopper? (4,3)
I believe the answer is:
pork pie
'whopper?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pork pie that I've seen before include "Melton Mowbray speciality - Cockney fib" , "sort of nut dressing" , "M eat and pastry dish" , "swallowed by gull" , "That isn't true" .)