Replace The Excerpt in Elementor Post widget with an ACF field

Been bashing this around for a while and getting nowhere.

Have used the following code

// Custom Excerpt function for Advanced Custom Fields
function custom_field_excerpt() {
	global $post;
	$text = get_field('the_excerpt'); //Replace 'your_field_name'
	if ( '' != $text ) {
		$text = strip_shortcodes( $text );
		$text = apply_filters('the_content', $text);
		$text = str_replace(']]>', ']]>', $text);
		$excerpt_length = 20; // 20 words
		$excerpt_more = apply_filters('excerpt_more', ' ' . '[...]');
		$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );
	}
	return apply_filters('post_excerpt', $text);
}

in an attempt to change the default the_excerpt text to my ACF field. I need this change to come through in Elementor post widget but it isn’t playing. Am I doing something wrong in the code above or is there another way of achieving the same result.

All thoughts appreciated