I think penance should be designed for very tiresome type (4,2,3,4)
I believe the answer is:
pain in the neck
'for very tiresome type' is the definition.
(pain in the neck can mean a very annoying person)
'i think penance should be designed' is the wordplay.
'i think penance' can be anagrammed to 'PAIN IN THE NECK'.
But, I am not clear how this is indicated.
Can you help me to learn more?
(Other definitions for pain in the neck that I've seen before include "Headache" , "bind" , "Torticollis" , "Annoyance (colloq.)" , "Very tiresome person or thing" .)