Discard a fragment (5)
I believe the answer is:
scrap
I believe this clue is a double definition.
'discard' is the first definition.
(I know that scrap is a more specific form of the action discard)
'a fragment' is the second definition.
(I know that scrap is a type of fragment)
(Other definitions for scrap that I've seen before include "Small fight about a smal fragment" , "Dispense with - waste material" , "Discarded metal or slang fight" , "Throw away - fight" , "Abandon" .)