Boris's repetition accepted for now (3,3)
I believe the answer is:
pro tem
'for now' is the definition.
('pro tem' can be a synonym of 'for now')
'boris's repetition accepted' is the wordplay.
'boris' becomes 'pm' (Boris Johnson).
'repetition' becomes 'rote' (I've seen this before).
'accepted' is an insertion indicator.
'pm' enclosing 'rote' is 'PRO TEM'.
(Other definitions for pro tem that I've seen before include "Temporarily" , "Informally, for the time being" , "until proper arrangement is made" , "not indefinitely extended" , "For the time being, to the old Romans in short" .)