Medicine man mostly reasonable after eating meat (6)
I believe the answer is:
shaman
'medicine man' is the definition.
(I've seen this before)
'mostly reasonable after eating meat' is the wordplay.
'mostly reasonable' becomes 'san' (I am not sure about this - if you are sure you should believe this answer much more).
'after eating' indicates putting letters inside.
'meat' becomes 'ham' (ham is a kind of meat).
'san' enclosing 'ham' is 'SHAMAN'.
Can you help me to learn more?
(Other definitions for shaman that I've seen before include "Witch doctor" , "16 21 [INDIAN IMPORT]" , "Man of spirit" , "Doctor-priest working by magic" , "who practises a form of spiritualism?" .)