Golfer's shout (4)
I believe the answer is:
fore
'golfer's shout' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fore that I've seen before include "Golfer's shouted warning" , "Ancestor" , "Warning cry of golfer" , "Warning cry on a golf course" , "Golfer's warning shout" .)