Small class is used to ritual (8)
I believe the answer is:
tutorial
'small class' is the definition.
'tutorial' can be an answer for 'class' (I've seen this before). I am unsure of the 'small' bit.
'used to ritual' is the wordplay.
'used' is an anagram indicator.
'to'+'ritual'='toritual'
'toritual' with letters rearranged gives 'TUTORIAL'.
'is' is the link.
Can you help me to learn more?
(Other definitions for tutorial that I've seen before include "Conference" , "Session of intensive teaching to an individual or small group" , "Seminar" , "Teaching session for a small number of students" , "Class" .)