Fairway alert (4)
I believe the answer is:
fore
'fairway alert' 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 "Golfer's warning shout" , "Warning cry of golfer" , "A golfer's warning cry - ball in flight" , "The front part of a ship" , "Not aft" .)