Low-quality films -- they're traditional at Christmas (7)
I believe the answer is:
turkeys
This clue is a double definition.
'low-quality films' is the first definition.
'they're traditional at christmas' is the second definition.
(Other definitions for turkeys that I've seen before include "Theatre flops or Christmas birds" , "Birds with fan-shaped tails" , "Movie flops" , "The birds for cranberry sauce, or theatre flops" .)