Brides mistakenly refuse (6)
I believe the answer is:
debris
'refuse' is the definition.
(both can mean rubbish)
'brides mistakenly' is the wordplay.
'mistakenly' indicates anagramming the letters.
'brides' is an anagram of 'DEBRIS'.
(Other definitions for debris that I've seen before include "Brides among rubble" , "Rubble, heap of broken pieces" , "Refuse, litter" , "Rubble, detritus" , "Rubble as of fallen building" .)