Hi @jameswilliams90
Your code is a bit of a jumble mate. I would definitely take some time to comment, indent and prettify you code.
What you want to write is this:
<?php
if( is_home() )
{
$cat_id = 3; //the certain category ID
$posts = get_posts(array(
'posts_per_page' => 1,
'category__in' => array($cat_id)
));
// get recent
$recent = $posts[0];
// echo
echo get_field('hello-readers', $recent->ID)
}
?>
