It's a hole, but a driver might stop there (3)
I believe the answer is:
pit
'it's a hole' is the definition.
(a pit is a large hole)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pit that I've seen before include "Mine; fruit stone" , "Quarry" , "Cavity" , "Tip into miners' shaft" , "Portland stone" .)