If you hear the clicking it could be the transmission. See from what side it's coming from and the exact position to confirm, the transmissions are hidden on both sides of the car where the "V" lever (moving the top and clamshell) is connected to the chassis. If it's coming from there it might be one of the nylon gears inside that broke a tooth or is cracked. To be sure you have to open it. It's not complicated just takes a bit of patience. There are guides on pelican parts on how to get to it. If the gear is toast you have 3 options: buy a new transmission for 700$, buy a used transmission from our resident parts guy Woody (user itsnotanova) or buy aftermarket gears that can be replaced in your transmission. They are made of steel or something similar and will never break but that's prob not a good idea because the oem ones are meant to break instead of bending something else on the mechanism. I think they are about 100$. I'd just buy a used transmission and replace it.. it's unlikely that it will break again for the lifetime of the car and even if it does you have to brake a lot before you spend 700$, the price of a new one
Good luck and let us know if we can help!
Cristian