Golfer’s warning cry (4)
I believe the answer is:
fore
'golfer's warning cry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fore that I've seen before include "At the bow" , "A golfer's warning cry - ball in flight" , "Placed in front" , "The front part of a ship" , "Warning cry on a golf course" .)