Strike in Mace (4)
I believe the answer is:
club
This clue is a double definition.
'strike' is the first definition.
(thesaurus)
'mace' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for club that I've seen before include "blackjack" , "Eg, wood, brassie" , "wood, perhaps" , "member in black suit > bash" , "Association of people with similar interests" .)