The ruined remnants of abandoned brides! (6)
I believe the answer is:
debris
'the ruined remnants of' is the definition.
The definition suggests a singular noun which matches the answer.
'abandoned brides' is the wordplay.
'abandoned' indicates anagramming the letters (the original order is abandoned).
'brides' anagrammed gives 'DEBRIS'.
Can you help me to learn more?
(Other definitions for debris that I've seen before include "Evidence of destruction" , "Rubble, detritus" , "aftermath of wild reception?" , "Scattered rubbish" , "Detritus, rubbish" .)