Uncontrolled slide (4)
I believe the answer is:
skid
'uncontrolled slide' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for skid that I've seen before include "Slip out of control" , "lose control momentarily" , "potential cause of accident" , "Lose control of a car" , "Slip, slide" .)