Belonging to the people in a race (6)
I believe the answer is:
tribal
'belonging to the people in a race' is the definition.
I can't judge whether this defines the answer.
'belonging to the people in' is the wordplay.
'belonging to' becomes 'trial' (I can't justify this - if you can you should give a lot more credence to this answer).
'the people' becomes 'B' (B is an example).
'in' means one lot of letters goes inside another.
'trial' going around 'b' is 'TRIBAL'.
Can you help me to learn more?
(Other definitions for tribal that I've seen before include "Of a traditional social group" , "socially divided" , "Clannish" , "between extended families" , "Relating to a group of families" .)