Reportedly intended to go on foot, but will drive them away (4)
I believe the answer is:
shoo
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for shoo that I've seen before include "Exclamation used to chase away animals" , "Sound uttered to make animals go away" , "Scat!" , "Expression to chase away an animal" , "Sling your hook!" .)