Healer with false alibi's first name (6)
I believe the answer is:
shaman
'healer' is the definition.
(I have seen 'Spiritual healer' mean 'shaman' so perhaps 'healer' could also mean 'shaman')
'with false alibi's first name' is the wordplay.
'with' means one lot of letters go next to another.
'false' becomes 'sham' (sham means fake or pretend).
'alibi's first' becomes 'a' (1st letter of 'alibi').
'name' becomes 'n' (common abbreviation e.g. on forms).
'sham' put next to 'a' is 'shama'.
'shama'+'n'='SHAMAN'
(Other definitions for shaman that I've seen before include "who practises a form of spiritualism?" , "Spirit guide" , "Asian doctor-priest" , "Sorcerer" , "Indian priest" .)