The clicker doesn't work, so you hopefully press it a few times and the deck suddenly jumps forward to the slide that gives away your unexpected strategy recommendation.
A clicker is any device that makes a clicking sound, usually when deliberately activated by its user.
They usually consist of a piece of thin metal or plastic held in a casing so that the metal is slightly torqued; depressing one end of the metal causes it to pop out of alignment and releasing it causes it to pop back into alignment, each time making a sharp click.