Part of the above money, including 50% from bank (6)
I believe the answer is:
casbah
'part' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?
I don't understand the rest of the clue.
(Other definitions for casbah that I've seen before include "Market place in N African towns" , "Citadel of N African cities" , "area round Algiers fortress" , "Native quarter of cities in northern Africa" , "Market place in a N African town" .)