Licensed carrier (3)
I believe the answer is:
car
'licensed carrier' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
This is the entire clue.
Can you help me to learn more?
(Other definitions for car that I've seen before include "Motor vehicle" , "Means of transport" , "Four-wheeled vehicle" , "Railway carriage; vehicle" , "estate, perhaps" .)