Clan nights with clan squads can be difficult to maintain as normal party sizes are limited to 8 while clan squads go up to 12.
This creates the process of 4 people being outside of the party having to join the game after the main party has entered and join the correct team and clan squad.
My suggestion is to allow an option on the menus to create a clan party with a max of 12 spots. Joining games while in a clan party auto creates a clan squad for you as well.