Football kicker's aid (3)
I believe the answer is:
tee
'football kicker's aid' 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 "'Drive off it, half-laughing (3)'" , "support of leisure activity" , "Golf ball support" , "Starting peg" , "A golfer hits from here" .)