Medicine man with counterfeit article (6)
I believe the answer is:
shaman
'medicine man' is the definition.
(I've seen this before)
'with counterfeit article' is the wordplay.
'with' is a charade indicator (letters next to each other).
'counterfeit' becomes 'sham' (similar in meaning).
'article' becomes 'an' (indefinite article).
'sham' next to 'an' is 'SHAMAN'.
(Other definitions for shaman that I've seen before include "Indian priest" , "Man of spirit" , "religious figure" , "Medium between the visible and spirit worlds" , "Sorcerer" .)