Crossword Genius

Union card (4)

Ross

I believe the answer is:

club

This clue is a double definition.

'union' is the first definition.
(thesaurus)

'card' is the second definition.
(club is a kind of card)

(Other definitions for club that I've seen before include "Place to meet one's friends with a weapon" , "Staff - association" , "Iron or putter, say" , "Association - bludgeon" , "'Short stick, card suit and association (4)'" .)

I've seen this clue in The Independent.
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