I have a function that I send a javascript array to like so:

if (VAR_clicked == "one") {
    FUN_Table(VAR_array_one);
} else if (VAR_clicked == "two") {
    FUN_Table(VAR_array_two);
} else if (VAR_clicked =="etc") {
    FUN_Table(VAR_array_etc);
}

My problem now is I have many more arrays and want to do something like this:

FUN_Table("VAR_array_" + VAR_clicked);

I’m trying to use a string to pass a variable to the function, this does not work.
Any ideas as to how I can do this?

You need to use 
eval()

to turn your string to a variable.

FUN_Table( eval("VAR_array_" + VAR_clicked) );

And then your string will become your “variable”.