Scoundrel follows with revolver (5)
I believe the answer is:
wheel
'revolver' is the definition.
(wheels revolve around)
'scoundrel follows with' is the wordplay.
'scoundrel' becomes 'heel' (heel can mean a scoundrel or villain).
'follows' means one lot of letters go next to another.
'with' becomes 'w' (abbreviation).
'heel' after 'w' is 'WHEEL'.
(Other definitions for wheel that I've seen before include "Roller on vehicle" , "Circular frame with spokes" , "Cog" , "Move in a circle" , "revolutionary device" .)