Failure, something for Christmas dinner (6)
I believe the answer is:
turkey
I believe this clue is a double definition.
'failure' is the first definition.
(I know that turkey is a type of bust)
'something for christmas dinner' is the second definition.
(turkey is often eaten on Christmas Day)
(Other definitions for turkey that I've seen before include "one gobbles" , "Eurasian republic" , "A failed play or a seasonal bird" , "One often getting stuffed" , "Edible bird; a dud" .)