Litter.
Debris, littered...
litter
Litter is a six letter word for scattered rubbish.
litter
Rubbish
Debris.
The word you get by rearranging the letters in "BRIDES," which fits the clue of "scattered rubbish or ruins," is " debris."
Litter
derbis
Jkol
The answer is debris when brides is rearranged.
DEBRIS