Freight platform (4)
I believe the answer is:
skid
'freight platform' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for skid that I've seen before include "Uncontrolled slide" , "Lose control of a car" , "Slip on wet ground" , "What car may do on ice - be careful" , "go out of control" .)