Weapon; association (4)
I believe the answer is:
club
I believe this clue is a double definition.
'weapon' is the first definition.
(weapon for hitting people with)
'association' is the second definition.
(I know that club is a type of association)
(Other definitions for club that I've seen before include "Bat - society" , "woman expects to be in" , "beat" , "'Short stick, card suit and association (4)'" , "Stout stick, card suit and association" .)