hi, recently had an engine swap (timing belt snapped

), new engine been on the car for a month now and covered 1500miles since. but now the engine or somewhere near the engine makes a little tapping/ knocking noise but when i press the clutch it goes away

if i let go it comes again . if i pump the clutch abit it seams to go away. no idea what it could be any help would be appriecated. thanks