Repetitive learning in the afternoon for the time being (3,3)
I believe the answer is:
pro tem
'for the time being' is the definition.
(synonyms)
'repetitive learning in the afternoon' is the wordplay.
'repetitive learning' becomes 'rote' (I've seen this in another clue).
'in the' means one lot of letters goes inside another.
'afternoon' becomes 'pm'.
'rote' put into 'pm' is 'PRO TEM'.
(Other definitions for pro tem that I've seen before include "until proper arrangement is made" , "Informally, for the time being" , "not indefinitely extended" , "For the present" , "Temporarily" .)