__ hog (4)
'hog' is the definition.
(I know that hog can be written as pig)
This is all the clue.
(Other definitions for pig that I've seen before include "Eg, sow" , "Difficult task" , "Quantity of metal" , "Boar or sow" , "Eat greedily" .)
(Other definitions for road that I've seen before include "Thoroughfare" , "See 10" , "Street" , "motorway?" , "Path" .)