Mark some golfer's cards (4)
I believe the answer is:
scar
'mark' is the definition.
('scar' can be a synonym of 'mark')
'some golfer's cards' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'SCAR' is hidden in the letters of 'golfers cards'.
(Other definitions for scar that I've seen before include "brand" , "Limestone cliff or outcrop" , "Indication of damage" , "Gordale - - , Yorks" , "Leave wound mark" .)