Trash that Wossy would call table tennis? (4-4)
I believe the answer is:
riff-raff
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for riff-raff that I've seen before include "Hoi polloi" , "Disreputable people" , "Rabble" , "rubbish" , "Dregs of society" .)