Belong, conform (3,2)
I believe the answer is:
fit in
This clue is a double definition.
'belong' is the first definition.
(I've seen this in another clue)
'conform' is the second definition.
(I've seen this before)
(Other definitions for fit in that I've seen before include "Find time for" , "Be in harmony (with)" , "Make room for; be acceptable" , "Make room or time for" , "Belong" .)