Followed the herd maybe but not as passenger (5)
I believe the answer is:
drove
'followed' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Maybe you can see a link between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for drove that I've seen before include "Travelled by car" , "Pushed" , "Flock being sent packing" , "Went by car" , "kicked hard" .)