Peg on a golf course (3)
I believe the answer is:
tee
'peg on a golf course' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tee that I've seen before include "Where one drives from" , "Golfing item" , "'Drive off it, half-laughing (3)'" , "Golf starting point" , "Golfer's starting point" .)