Scrap Mark did without (7)
I believe the answer is:
discard
'scrap' is the definition.
(scrap can mean to discard)
'mark did without' is the wordplay.
'mark' becomes 'scar' (mark left by an injury).
'without' is an insertion indicator.
'scar' put within 'did' is 'DISCARD'.
(Other definitions for discard that I've seen before include "Shed" , "Reject" , "Throw away or cast off" , "bin" , "Get rid of" .)