yung pong case na matagal ka ng tumatakbo then pag nagfull stop ka, mahirap ipasok sa first gear and pag magrereverse ka naman eh ang ingay ng makina? Can you consider it clutch sliding?
no, there is probably some worn out clutch system components, like release bearing or pressure-plate.
As for the "ingay ng makina", baka ibang issue naman yan, not related to clutch/transmission system.