Company car once made by Ford (6)
I believe the answer is:
escort
I believe this is a double definition.
'company' is the first definition.
(I've seen this before)
'car once made by ford' is the second definition.
(Ford Escort, former Ford car)
(Other definitions for escort that I've seen before include "guide" , "Provide company - car - attendant" , "going in convoy" , "attendance" , "Companion, perhaps for protection" .)