To remind or let someone know the truth of a topic or situation that one may have gotten confused or misjudged. Basically another statement for “Get it right, don’t get it twisted.”
Person 2:that is why yo mama dead what shoes she got on?
person 3" you clocked her tea girl'
the girl spoke back smartly so person 3 said "clock that tea girl"
Engaging in sexual activities with a Clown, with clock referring to a Clown's cock and "clicking" corresponding to whatever sexual act you have in mind. ;)
Zach: "Hey Nathan, have you seen Julia around anywhere today?"
Nathan: "I am pretty sure that she went to the State Fair to click on that clock!"
or
The adults of Derry, Maine ventured into the sewers to click on that clock.