[fowlplay4]

Well first off put your script in PHP tags for the sake of readability.

Instead of using addstring you can just do the following:

pl.clientr.clan.add(this.clan);

There's also (Using your example variables):

pl.clientr.clan.delete(index);
pl.clientr.clan.remove("string");
pl.clientr.clan.insert(index, "string");