A person who hits or strikes with a club, or someone who frequently attends clubs.
From 'club' (either the noun referring to a weapon or the verb meaning to hit, or a social establishment) plus the agent suffix '-er,' creating one who clubs or belongs to clubs.
A clubber could be a caveman with a weapon, a bouncer at a nightclub, or a dedicated club-goer—one word with wildly different meanings depending on historical period and context.
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