Scoundrels going after black shoes (7)
I believe the answer is:
brogues
'shoes' is the definition.
(I know this)
'scoundrels going after black' is the wordplay.
'scoundrels' becomes 'rogues' (rogue is a kind of scoundrel).
'going after' says to put letters next to each other.
'black' becomes 'b' (abbreviation as in pencil classifications).
'rogues' after 'b' is 'BROGUES'.
(Other definitions for brogues that I've seen before include "Oxford and Derby, for example" , "Lace-up shoes" .)