Edit in JSFiddle

var Api, $root;

Api = {
    getSandboxedJQuery: function get$($target){
        return function(){
            var selector = null,
                args = Array.prototype.slice.call(arguments);
    
            if (args.length == 1 && (typeof (selector = args[0]) == 'string')){
                return $.apply(this, args.concat($target));
            }
            return $.apply(this, arguments);
        };
    }
};
$root = $('.root');

$(function(Api){
    var $ = Api.getSandboxedJQuery($root);

    alert('Initial state: both divs are green. Color will be applied to the selected elements.');

    jQuery('.target').css('background-color', 'yellow');
    alert('Yellow background applied to selected elements. Even elements outside our root element have been selected.');

    $('.target').css('background', 'pink');
    alert('Pink background applied to selected elements. No elements outside our root element have been selected.');
}(Api));
<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title>Sandbox jQuery in a module</title>
</head>
    
<body>
    <div class="root">
        <div class="target hit"></div>
    </div>

    <div class="target miss"></div>
</body>
</html>
body {
    text-align: center;
}

.target {
    height: 100px;
    width: 100px;
    background-color: green;
    border: solid 1px black;
    margin-top: 20px;
}