Drunken bride succeeded causing wreckage (6)
I believe the answer is:
debris
'wreckage' is the definition.
(I've seen this in another clue)
'drunken bride succeeded' is the wordplay.
'drunken' is an anagram indicator.
'succeeded' becomes 's' (genealogical abbreviation).
'bride' with letters rearranged gives 'debri'.
'debri'+'s'='DEBRIS'
'causing' is the link.
(Other definitions for debris that I've seen before include "'Ruins, rubble (6)'" , "Brides among rubble" , "Rubble, heap of broken pieces" , "Fragments of rubbish" , "Rubble, lots of broken pieces" .)