If anyone is able to make a Clan plugin for 1.12.2, since MCClans does not work on 1.12.2.
What it needs is just simple really
/team create [Prefix] [Name]
/team color Red/Blue etc Colors.
/team invite
/team deny
/team accept
/team list
/team sethome
/team home
/team chat
/team rank create [Rank]
/team rank permission [Rank] [Permission]
/team rank permission list
/team rank list