"God is tripartite" corrected conjuror (15)
I believe the answer is:
prestidigitator
'conjuror' is the definition.
('prestidigitator' can be a synonym of 'conjuror')
'god is tripartite corrected' is the wordplay.
'corrected' indicates an anagram.
'god'+'is'+'tripartite'='godistripartite'
'godistripartite' is an anagram of 'PRESTIDIGITATOR'.
(Other definitions for prestidigitator that I've seen before include "Entertainer" , "Tricky performer" , "Illusionist" , "Conjuror" .)