Tire stud out? Rubbish! (8)
I believe the answer is:
detritus
'rubbish' is the definition.
(detritus is a kind of rubbish)
'tire stud out?' is the wordplay.
'out?' indicates anagramming the letters (out can mean wrong or inaccurate).
'tire'+'stud'='tirestud'
'tirestud' is an anagram of 'DETRITUS'.
(Other definitions for detritus that I've seen before include "Refuse" , "Rubbish - it rusted (anag)" , "Accumulation of debris - it rusted (anag)" , "Debris, dust" , "Accumulated debris" .)