Essentially, Leicester supporters wanting a German left-winger (6)
I believe the answer is:
engels
'left-winger' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for engels that I've seen before include "Friedrich -, Marx collaborator" , "Communism founder" , "Friedrich ---, helped Marx" , "Marx's patron" , "Early Communist philosopher" .)