Card one used at Augusta? (4)
I believe the answer is:
club
'card' is the definition.
(the clubs are a playing card suit)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for club that I've seen before include "member in black suit > bash" , "Eg, wood, brassie" , "Society - weapon" , "'Short stick, card suit and association (4)'" , "Driver possibly" .)