The term 'FORE!, FOR ONE' is a golfing term used to ALERT other players that a ball has been hit in their direction. The crossword solutions for this term are ALERT (5 letters) and CRY (3 letters). ALERT is an appropriate solution as it is a warning to other players that a ball is coming their way. CRY is also an appropriate solution as it is a sound that is often associated with surprise or shock, which is what one might experience when a ball is suddenly headed their way.