Car making a river crossing (4)
I believe the answer is:
ford
I believe this is a double definition.
'car' is the first definition.
(ford is a make of car)
'a river crossing' is the second definition.
(I've seen this before)
'making' acts as a link.
(Other definitions for ford that I've seen before include "Shallow area in a stream where it can be crossed" , "Wade across" , "Famous American of yesteryear" , "White paint for the face" , "Ex-president" .)