Iota - free-for-all (5)
I believe the answer is:
scrap
I believe this clue is a double definition.
'iota' is the first definition.
(thesaurus)
'free-for-all' is the second definition.
(I've seen this in another clue)
(Other definitions for scrap that I've seen before include "argument" , "Small (leftover) piece" , "Just a fragment, maybe of food" , "Leftover; fight" , "Waste metal or informal fight" .)