Brides tidy up the rubble (6)
I believe the answer is:
debris
'the rubble' is the definition.
(synonyms)
'brides tidy up' is the wordplay.
'tidy up' is an anagram indicator (I've seen 'tidying up' mean this (Tidying up is rearranging)).
'brides' with letters rearranged gives 'DEBRIS'.
(Other definitions for debris that I've seen before include "Brides with pieces of rubble" , "Rocky fragments" , "Remains - wreckage" , "Fragments of wreckage" , "Evidence of destruction" .)