Luther's terrible cheat (7)
I believe the answer is:
hustler
'cheat' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'luther's terrible' is the wordplay.
'terrible' indicates anagramming the letters.
'luthers' anagrammed gives 'HUSTLER'.
Can you help me to learn more?
(Other definitions for hustler that I've seen before include "Prostitute" , "Aggressive seller" , "Illicit dealer (mainly US)" , "Energetic or crooked operator" , "Aggressive dealer" .)