I installed clipit by following the instructions on this page for Ubuntu (https://github.com/CristianHenzel/ClipIt#on-ubuntu) so I used the command sudo apt-get install build-essential git automake xdotool autoconf intltool autopoint gtk+-3.0 and then

tar zxvf clipit-x.y.z.tar.gz

cd clipit-x.y.z

./autogen.sh

./configure --with-gtk3 

make

sudo make install

It was not showing up on the dash and I was not able to perform any modifications on its settings through preferences or any other options. So, I uninstalled it with sudo apt-get purge clipit and then sudo apt-get autoremove
I also tried remove command but it seems nothing worked and it still is usable and being shown when I search for it.

I also tried to remove it from ubuntu software but it didn't show remove but showed the button to install. I tried the command dpkg --list to see if clipit was there before starting any procedure for uninstalling but it didn't show there before and after.
H

How can I uninstall clipit completely without any trace?

Edit: This answer helped me solve this problem:
https://askubuntu.com/a/71245/1416525

It seems that you can't remove apps from the Dash, however you can manage your launchers (*.desktop files) in one of the following directories:
/usr/share/applications
/usr/local/share/applications
~/.local/share/applications
If your launcher file is in any of the first two directories, you will require root permissions to remove it.