New name? So be it (4)
I believe the answer is:
amen
'so be it' is the definition.
(I've seen this in another clue)
'new name?' is the wordplay.
'new' indicates anagramming the letters.
'name' is an anagram of 'AMEN'.
(Other definitions for amen that I've seen before include "Word of approval" , "Prayer ending" , "statement of affirmation" , "Name for end to prayer" , "Churchgoer's assent?" .)