In a trice he is converted to nonconformist (7)
I believe the answer is:
heretic
'nonconformist' is the definition.
(I know that heretic is a type of nonconformist)
'in a trice he is converted' is the wordplay.
'trice he' anagrams to 'HERETIC'.
Though, I am not clear how this is indicated.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for heretic that I've seen before include "Nonconformist" , "dissenter" , "person with the wrong outlook" , "One whose opinions are contrary to accepted religious beliefs" , "contrarian" .)