Scoundrels on foot (5)
I believe the answer is:
heels
'scoundrels' is the definition.
(heel is a kind of scoundrel)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for heels that I've seen before include "Foot parts" , "Cobbler does this" , "Parts of shoes" , "Tilts to one side" , "Cads; lists" .)