The clicking can often be from the crank arm slipping off the bolt. Try removing the nut. Taking a rubber mallet to the crank arm and ensuring it is as tight as it can possibly can be before tightening the nut. The nut cannot be tightened so much as to push the crank arm on. It is only there as a safety measure. If you don’t have mallet use a block of wood and a hammer. It takes a lot of force to get it on fully.