Sheltered by Christian, I get into trouble (3,2)
I believe the answer is:
cop it
'get into trouble' is the definition.
(to cop it is to receive punishment)
'sheltered by christian i' is the wordplay.
I cannot really see how this works, but
'i' is within the answer.
'christian' could be 'copt' (member of the Coptic Church, a Christian church) and 'copt' is found within the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cop it that I've seen before include ""get in loads of trouble!"" , "Be punished" , "Get into trouble; be killed" , "Get it in the neck" , "Suffer the consequences!" .)