Scoundrel going after black shoe (6)
I believe the answer is:
brogue
'shoe' is the definition.
(brogue is a type of shoe)
'scoundrel going after black' is the wordplay.
I cannot really see how this works, but
'scoundrel' could be 'rogue' (rogue is a kind of scoundrel) and 'rogue' is located in the answer.
'black' could be 'b' (abbreviation as in pencil hardness) and 'b' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for brogue that I've seen before include "What might identify an Irishman" , "Footprint could be left by this" , "Shoe - tongue" , "afoot?" , "Irish or Scottish accent?" .)