KrisKross goes through change, becoming another setter (6)
I believe the answer is:
cement
'setter' is the definition.
(something that sets)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for cement that I've seen before include "Seal; bonding agent" , "Ingredient of concrete" , "material for bonding" , "joiner" , "Bind firmly" .)