End of the beef soup? (6)
I believe the answer is:
oxtail
This might be a double definition.
'end' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'the beef soup?' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for oxtail that I've seen before include "part of liquid lunch?" , "Farm animal's ending" , "Nice soup made from bovine appendage" , "Sort of soup" , "Type of beef soup" .)