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<!-- GOES IN FUNCTIONS.PHP -->
<?php
function custom_field_excerpt($title) {
	global $post;
	$text = get_field($title);
	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('the_excerpt', $text);
}
?>

<!-- THEN USE THIS IN THEME -->
<?php echo custom_field_excerpt('field_name'); ?>