Clan member bound by regulations (2-3)
I believe the answer is:
in-law
I believe this clue is a double definition.
'clan member' is the first definition.
'bound by regulations' is the second definition.
(Other definitions for in-law that I've seen before include "Near relative" , "Relation by marriage" , "Spouse's relation" , "Family member, by marriage" , "Meghan to Harry's family?" .)