Punching marked (8)
I believe the answer is:
striking
I believe this clue is a double definition.
'punching' is the first definition.
(both can mean hitting)
'marked' is the second definition.
(thesaurus)
(Other definitions for striking that I've seen before include "Conspicuously impressive" , "stopping work" , "Attracting attention by reason of being unusual" , "Delivering a blow" , "Conspicuous" .)