Shortcode to display one item from a repeatable field

Add a new function, item_three with a Code Snippets plugin or by adding the below code to a new folder/file.php in wp-content/plugins/

<?php
/**
  * Plugin Name: Item Three
  * Description: Display the third item in a list.
  */
function item_three( $items ) {
	$key = 2; // Items are zero-indexed. 2 is 3.
	if ( array_key_exists( $key, (array) $items ) ) {
		return $items[ $key ];
	}
	return ''; // Blank if there is nothing.
}

…then add item_three to the comma-separated list labeled Display callbacks allowed near the bottom of Pods Admin > Settings

The shortcode to display the third item of repeatable field field_name will now be:

[pods]{@field_name,item_three}[/pods]