Debris of battle (5)
I believe the answer is:
scrap
I believe this clue is a double definition.
'debris' is the first definition.
(thesaurus)
'battle' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for scrap that I've seen before include "Fight; abolish" , "Argy-bargy" , "Waste metal or informal fight" , "Informal fight for waste material" , "Break up - fight" .)