Mark for every run (7)
I believe the answer is:
scarper
'run' is the definition.
(synonyms)
'mark for every' is the wordplay.
'mark' becomes 'scar' (mark left by an injury).
'for every' becomes 'per' ('per' means 'for each' or 'for every').
'scar'+'per'='SCARPER'
(Other definitions for scarper that I've seen before include "Run away (colloq.)" , "Damage" , "bolt" , "Vamoose" , "Escape" .)