Whopper filling found in recipes in Burger King? (5)
I believe the answer is:
liege
'recipes in burger king?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'whopper filling found in' is the wordplay.
'whopper' becomes 'lie' (I've seen this before).
'filling' becomes 'eg' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'found in' is an insertion indicator.
'lie' enclosing 'eg' is 'LIEGE'.
Can you help me to learn more?
(Other definitions for liege that I've seen before include "City in eastern Belgium" , "Belgian city - master - servant" , "Chieftain" , "European university" , "Old sovereign" .)