In World of Tanks a derogative term for someone playing SPG (Artillery, shortened to Arty) vehicles due to the fact that those vehicles have such a wide firing range and firing arc so they hardly need to move at all, hence to click on targets only.
I can't stand going to church with those clickers. They start clicking their tongues one minute and the next thing you know their rolling around on the floor with a bunch of snakes!
A lazy person who can't speak during a group presentation and can only contribute by clicking through the slides.
Person - "I contributed to the presentation by clicking through the slides. It's essential for the slides to by in sync with the other person who is speaking."
Team member1 - "He doesn't contribute"
Team member 2 - "He can be the clicker"