Withdraw with minor injury (7)
I believe the answer is:
scratch
I believe this is a double definition.
'withdraw' is the first definition.
(I know that scratch is a more specific form of cancel)
'minor injury' is the second definition.
(I've seen this before)
'with' acts as a link.
(Other definitions for scratch that I've seen before include "withdraw from event" , "score with > no handicap given" , "Mark made by sharp point" , "Superficial damage; withdraw" , "Lacerate" .)