Relatively close? (8)
I believe the answer is:
clannish
'relatively close?' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for clannish that I've seen before include "Sticking to one group" , "about family" , "Tending to exclude those outside the group" , "Excluding others outside one's own group" , "Like group sticking together" .)