Injury with no handicap (7)
I believe the answer is:
scratch
I believe this is a double definition.
'injury' is the first definition.
(I know that scratch is a type of lesion)
'no handicap' is the second definition.
(scratch handicap is a zero handicap in golf)
'with' acts as a link.
(Other definitions for scratch that I've seen before include "Such a good golfer" , "claw" , "Improvised" , "slight injury" , "small injury" .)