Men in further education giving warning on course (4)
I believe the answer is:
fore
'warning on course' is the definition.
'fore' can be an answer for 'warning' (I've seen this in other clues). I am not sure about the 'on course' bit.
'men in further education' is the wordplay.
'men' becomes 'or' (military abbreviation for Other Ranks).
'in' indicates putting letters inside.
'further education' becomes 'fe' (this might be a standard abbreviation of which I'm unaware).
'or' placed into 'fe' is 'FORE'.
'giving' is the link.
Can you help me to learn more?
(Other definitions for fore that I've seen before include "Warning cry of golfer" , "At the bow" , "Ancestor" , "Golfer's shouted warning" , "Word of warning to golfers" .)