Rubbish, this and that originally (3)
I believe the answer is:
tat
'rubbish' is the definition.
(tat can mean rubbish or poor-quality material)
'this and that originally' is the wordplay.
'originally' suggests taking the first letters.
The first letters of 'this and that' is 'TAT'.
(Other definitions for tat that I've seen before include "Shoddy items" , "Utterly tasteless objects" , "Shoddy articles" , "Tasteless articles" , "Tawdry or shabby articles" .)