Awfully mean thing to say in church (4)
I believe the answer is:
amen
'thing to say in church' is the definition.
I can't judge whether this defines the answer.
'awfully mean' is the wordplay.
'awfully' indicates anagramming the letters.
'mean' is an anagram of 'AMEN'.
Can you help me to learn more?
(Other definitions for amen that I've seen before include "Put name to end of payer" , "prayer's ending" , "Prayer ending" , "Name for end to prayer" , "Extremist" .)