Self-driving car that is made to leave, leaves (4)
I believe the answer is:
herb
'leave leaves' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for herb that I've seen before include "Savoury plant" , "Basil, for example, is one" , "Rosemary, for example" , "plant with useful properties" , "ingredient for recipe?" .)