Thanks for your comments. I agree that either 'last closer' or 'boot closer' would make more sense. Although I don't know what the 'closer' part refers to.
Unfortunately the image is not available with the 1851 Scotland census, so we can't see what the writing looked like.
By the way, I did a search for 'bast', and there is such a word, apparently it is a fibrous mat that comes from beneath the bark of certain trees. And it was used to make very inferior quality shoes in ancient times, but almost certainly not in C19. So I agree with the 'last' or 'boot'.
Cheers
Rex