Here's one way to clear dried glue from a nozzle tip.
Cut the end of a Q-tip stick off at an angle. (I use a LOT of Q-tips when I make rockets.)
Turn the nozzle like you are opening it up for gluing. Pull the nozzle off the bottle by pulling hard straight up.
Push the dried glue plug out from the bottom. The angled cut end should go through the small nozzle hole cutting through the dried glue.