Converted to ritual in class (8)
I believe the answer is:
tutorial
'class' is the definition.
(I've seen this before)
'converted to ritual' is the wordplay.
'converted' is an anagram indicator.
'to'+'ritual'='toritual'
'toritual' anagrammed gives 'TUTORIAL'.
'in' acts as a link.
(Other definitions for tutorial that I've seen before include "Rail tout (anag)" , "Period of individual instruction" , "Session with a private instructor" , "Period of teaching as from college lecturer" , "Session of intensive teaching to an individual or small group" .)