Old Persian leader isn't finished with guy who has a good knowledge of foreign spirits (6)
I believe the answer is:
shaman
'foreign spirits' is the definition.
I know that 'spirits' relates to this answer. I also know that both the answer and definition are singular nouns
'old persian leader isn't finished with guy who has a good knowledge' is the wordplay.
I cannot really see how this works, but
'guy' could be 'man' (I've seen this before) and 'man' is found in the answer.
an anagram of 'has' is 'sha' which is located in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for shaman that I've seen before include "Witch doctor" , "religious figure" , "Sorcerer" , "16 21 [INDIAN IMPORT]" , "Asian doctor-priest" .)