Crossword Genius

A weapon by association (4)

Ross

I believe the answer is:

club

I believe this clue is a double definition.

'a weapon' is the first definition.
(I've seen this before)

'association' is the second definition.
(I know that association can be written as club)

'by' acts as a link.

(Other definitions for club that I've seen before include "Stout stick, card suit and association" , "sort of sandwich" , "Kind of weapon or golf stick" , "Place to meet one's friends with a weapon" , "Association for people with common interest" .)

I've seen this clue in the Sydney Morning Herald.
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