One for the road (4)
'one for the road' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for auto that I've seen before include "Prefix to denote self or same" , "Car (mostly US)" , "Car (chiefly in US)" , "Prefix meaning self or same" , "Car (American)" .)
'one for the road?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for car that I've seen before include "Auto" , "Vehicle carrying vehicles" , "Wheels" , "Road vehicle; rail coach" , "Passenger vehicle" .)