The term 'SHAKER STUFF' can be broken down into two words, 'SHAKER' and 'STUFF'. The word 'SHAKER' refers to the religious sect of the same name, which was founded in the 18th century in England. The Shakers were known for their simple lifestyle and their commitment to hard work. The word 'STUFF' is a general term for material possessions or items. In this case, the crossword solution for 'SHAKER STUFF' is the four-letter word 'SALT'. This is likely referring to the fact that the Shakers were known for their SALT-making industry, which was an important part of their economy.