Set Single template for Taxonomy Term #single-taxonomy-term.php

functions.php

add_filter( 'template_include', function ( $template ) {
	if ( is_singular( 'POST_TYPE_NAME' ) ) {
		$term         = get_the_terms( null, 'TAXONOMY_NAME' );
		$new_template = locate_template( array( 'TEMPLATE_NAME.php' ) );
		if ( isset( $term[0]->slug ) && $term[0]->slug == 'TERM_NAME' && '' != $new_template ) {
			return $new_template;
		}
	}
	
	return $template;
}, 99 );