Rubbish underwear (5)
I believe the answer is:
pants
This clue is a double definition.
'rubbish' is the first definition.
(informal term meaning poor-quality)
'underwear' is the second definition.
(underpants)
(Other definitions for pants that I've seen before include "Rubbish -- underwear" , "Undergarments; rubbish" , "Useless (slang) - gasps" , "longs" , "Knickers" .)