Assault a baseball player (6)
I believe the answer is:
batter
I believe this is a double definition.
'assault' is the first definition.
(thesaurus)
'a baseball player' is the second definition.
(batter is a kind of baseball player)
(Other definitions for batter that I've seen before include "Mixture for pancakes etc" , "Hit hard and often, subject to repeated violence" , "Fritter coating" , "Yorkshire pudding and cricket both require this" , "Mixture of flour, eggs and milk, used in cooking" .)