River crossing for a car (4)
I believe the answer is:
ford
I believe this clue is a double definition.
'river crossing' is the first definition.
(I've seen this before)
'for a car' is the second definition.
(Ford is a make of car)
(Other definitions for ford that I've seen before include "Henry ...., first mass producer of cars" , "Car - river crossing" , "River or stream crossing" , "US President - river crossing" , "Shallow river-crossing" .)