Doing a farrier's work involves the process of shoeing horses. This is done by a farrier, who is a specialist in equine hoof care. The farrier trims and balances the hooves, then fits and nails on horseshoes to protect the hooves from wear and tear. The farrier also repairs and replaces worn or damaged horseshoes. The term 'SHOE' is used to refer to this process, which is why it is the answer to the crossword puzzle.