Winter Olympics sled (4)
I believe the answer is:
luge
'winter olympics sled' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for luge that I've seen before include "Winter Olympic event" , "Form of transport" , "Toboggan used in the Winter Olympics" , "Glue (anag) - racing toboggan" , "Glue for a one-man sledge" .)