UKPassats

while spending another 3 hours searching for a rattle & slight knock over bumps while coasting over them , i replaced the anti rattle clips with new ones this time problem solved for the rattle , onto the knock i have discovered the drivers driveshaft ( where the knock appears to be coming from ) has play while wiggling it left to right roughly 1 maybe 2cm i check the other side and it has maybe 2mm at most.
would this cause the knock while coasting over bumps?
& how much am i looking at for a replacement?