Light toboggan (4)
I believe the answer is:
luge
'light toboggan' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for luge that I've seen before include "Winter Olympic event" , "Glue (anag) - racing toboggan" , "Olympics sledge" , "Toboggan used in the Winter Olympics" , "Form of transport" .)