A pig on the road? (3)
I believe the answer is:
hog
'a pig' is the definition.
(I know that pig can be written as hog)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hog that I've seen before include "Domesticated pig" , "A male pig or a greedy person" , "Monopolise" , "Selfish type" , "Pig reared for slaughter" .)